diff --git a/chrome/browser/bookmarks/bookmark_utils.cc b/chrome/browser/bookmarks/bookmark_utils.cc
index 025de3191c8886..ddd60a9a9ab856 100644
--- a/chrome/browser/bookmarks/bookmark_utils.cc
+++ b/chrome/browser/bookmarks/bookmark_utils.cc
@@ -175,11 +175,11 @@ bool ShouldOpenAll(gfx::NativeWindow parent,
   if (child_count < bookmark_utils::num_urls_before_prompting)
     return true;
 
-  return browser::ShowMessageBox(parent,
+  return chrome::ShowMessageBox(parent,
       l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
       l10n_util::GetStringFUTF16(IDS_BOOKMARK_BAR_SHOULD_OPEN_ALL,
                                  base::IntToString16(child_count)),
-      browser::MESSAGE_BOX_TYPE_QUESTION) == browser::MESSAGE_BOX_RESULT_YES;
+      chrome::MESSAGE_BOX_TYPE_QUESTION) == chrome::MESSAGE_BOX_RESULT_YES;
 }
 
 // Comparison function that compares based on date modified of the two nodes.
@@ -710,11 +710,11 @@ bool NodeHasURLs(const BookmarkNode* node) {
 bool ConfirmDeleteBookmarkNode(const BookmarkNode* node,
                                gfx::NativeWindow window) {
   DCHECK(node && node->is_folder() && !node->empty());
-  return browser::ShowMessageBox(window,
+  return chrome::ShowMessageBox(window,
       l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
       l10n_util::GetStringFUTF16Int(IDS_BOOKMARK_EDITOR_CONFIRM_DELETE,
                                     ChildURLCountTotal(node)),
-      browser::MESSAGE_BOX_TYPE_QUESTION) == browser::MESSAGE_BOX_RESULT_YES;
+      chrome::MESSAGE_BOX_TYPE_QUESTION) == chrome::MESSAGE_BOX_RESULT_YES;
 }
 
 void DeleteBookmarkFolders(BookmarkModel* model,
diff --git a/chrome/browser/chrome_browser_main_win.cc b/chrome/browser/chrome_browser_main_win.cc
index 69d0707eac2b4a..5939c47fa8c534 100644
--- a/chrome/browser/chrome_browser_main_win.cc
+++ b/chrome/browser/chrome_browser_main_win.cc
@@ -91,19 +91,18 @@ void RecordBreakpadStatusUMA(MetricsService* metrics) {
 
 void WarnAboutMinimumSystemRequirements() {
   if (base::win::GetVersion() < base::win::VERSION_XP) {
-    const string16 title = l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
-    const string16 message =
-        l10n_util::GetStringUTF16(IDS_UNSUPPORTED_OS_PRE_WIN_XP);
-    browser::ShowMessageBox(NULL, title, message,
-                            browser::MESSAGE_BOX_TYPE_WARNING);
+    chrome::ShowMessageBox(NULL,
+        l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
+        l10n_util::GetStringUTF16(IDS_UNSUPPORTED_OS_PRE_WIN_XP),
+        chrome::MESSAGE_BOX_TYPE_WARNING);
   }
 }
 
 void ShowCloseBrowserFirstMessageBox() {
-  const string16 title = l10n_util::GetStringUTF16(IDS_PRODUCT_NAME);
-  const string16 message = l10n_util::GetStringUTF16(IDS_UNINSTALL_CLOSE_APP);
-  browser::ShowMessageBox(NULL, title, message,
-                          browser::MESSAGE_BOX_TYPE_WARNING);
+  chrome::ShowMessageBox(NULL,
+                         l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
+                         l10n_util::GetStringUTF16(IDS_UNINSTALL_CLOSE_APP),
+                         chrome::MESSAGE_BOX_TYPE_WARNING);
 }
 
 int DoUninstallTasks(bool chrome_still_running) {
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index c82988bbf2f4d4..91907f42b22877 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -407,7 +407,7 @@ content::WebContentsView*
 content::WebContentsViewDelegate*
     ChromeContentBrowserClient::GetWebContentsViewDelegate(
         content::WebContents* web_contents) {
-  return browser::CreateWebContentsViewDelegate(web_contents);
+  return chrome::CreateWebContentsViewDelegate(web_contents);
 }
 
 void ChromeContentBrowserClient::RenderViewHostCreated(
diff --git a/chrome/browser/chromeos/extensions/file_manager_util.cc b/chrome/browser/chromeos/extensions/file_manager_util.cc
index b94a84396d44df..49cd9defe41640 100644
--- a/chrome/browser/chromeos/extensions/file_manager_util.cc
+++ b/chrome/browser/chromeos/extensions/file_manager_util.cc
@@ -214,13 +214,13 @@ void ShowWarningMessageBox(Profile* profile, const FilePath& path) {
   // TODO: if FindOrCreateTabbedBrowser creates a new browser the returned
   // browser is leaked.
   Browser* browser = browser::FindOrCreateTabbedBrowser(profile);
-  browser::ShowMessageBox(
+  chrome::ShowMessageBox(
       browser->window()->GetNativeWindow(),
       l10n_util::GetStringFUTF16(
           IDS_FILE_BROWSER_ERROR_VIEWING_FILE_TITLE,
           UTF8ToUTF16(path.BaseName().value())),
       l10n_util::GetStringUTF16(IDS_FILE_BROWSER_ERROR_VIEWING_FILE),
-      browser::MESSAGE_BOX_TYPE_WARNING);
+      chrome::MESSAGE_BOX_TYPE_WARNING);
 }
 
 // Called when a file on GData was found. Opens the file found at |file_path|
diff --git a/chrome/browser/extensions/extension_error_reporter.cc b/chrome/browser/extensions/extension_error_reporter.cc
index 6f85a744f73860..e5abe83451f483 100644
--- a/chrome/browser/extensions/extension_error_reporter.cc
+++ b/chrome/browser/extensions/extension_error_reporter.cc
@@ -56,8 +56,8 @@ void ExtensionErrorReporter::ReportError(const string16& message,
   LOG(ERROR) << "Extension error: " << message;
 
   if (enable_noisy_errors_ && be_noisy) {
-    browser::ShowMessageBox(NULL, ASCIIToUTF16("Extension error"), message,
-                            browser::MESSAGE_BOX_TYPE_WARNING);
+    chrome::ShowMessageBox(NULL, ASCIIToUTF16("Extension error"), message,
+                           chrome::MESSAGE_BOX_TYPE_WARNING);
   }
 }
 
diff --git a/chrome/browser/extensions/extensions_startup.cc b/chrome/browser/extensions/extensions_startup.cc
index 54dc2e26632a3d..94caf2ecc5fdfa 100644
--- a/chrome/browser/extensions/extensions_startup.cc
+++ b/chrome/browser/extensions/extensions_startup.cc
@@ -18,16 +18,16 @@ void ExtensionsStartupUtil::OnPackSuccess(
     const FilePath& crx_path,
     const FilePath& output_private_key_path) {
   pack_job_succeeded_ = true;
-  browser::ShowMessageBox(NULL, ASCIIToUTF16("Extension Packaging Success"),
+  chrome::ShowMessageBox(NULL, ASCIIToUTF16("Extension Packaging Success"),
       PackExtensionJob::StandardSuccessMessage(crx_path,
                                                output_private_key_path),
-      browser::MESSAGE_BOX_TYPE_INFORMATION);
+      chrome::MESSAGE_BOX_TYPE_INFORMATION);
 }
 
 void ExtensionsStartupUtil::OnPackFailure(const std::string& error_message,
                                           ExtensionCreator::ErrorType type) {
-  browser::ShowMessageBox(NULL, ASCIIToUTF16("Extension Packaging Error"),
-      UTF8ToUTF16(error_message), browser::MESSAGE_BOX_TYPE_WARNING);
+  chrome::ShowMessageBox(NULL, ASCIIToUTF16("Extension Packaging Error"),
+      UTF8ToUTF16(error_message), chrome::MESSAGE_BOX_TYPE_WARNING);
 }
 
 bool ExtensionsStartupUtil::PackExtension(const CommandLine& cmd_line) {
diff --git a/chrome/browser/hang_monitor/hung_plugin_action.cc b/chrome/browser/hang_monitor/hung_plugin_action.cc
index 35ae2a4d528534..06684258bdad4c 100644
--- a/chrome/browser/hang_monitor/hung_plugin_action.cc
+++ b/chrome/browser/hang_monitor/hung_plugin_action.cc
@@ -113,9 +113,9 @@ bool HungPluginAction::OnHungWindowDetected(HWND hung_window,
                           HungWindowResponseCallback,
                           reinterpret_cast<ULONG_PTR>(this));
       current_hung_plugin_window_ = hung_window;
-      if (browser::ShowMessageBox(NULL, title, message,
-          browser::MESSAGE_BOX_TYPE_QUESTION) ==
-          browser::MESSAGE_BOX_RESULT_YES) {
+      if (chrome::ShowMessageBox(NULL, title, message,
+          chrome::MESSAGE_BOX_TYPE_QUESTION) ==
+          chrome::MESSAGE_BOX_RESULT_YES) {
         *action = HungWindowNotification::HUNG_WINDOW_TERMINATE_PROCESS;
       } else {
         // If the user choses to ignore the hung window warning, the
diff --git a/chrome/browser/importer/importer_host.cc b/chrome/browser/importer/importer_host.cc
index 38d51fb1f62c66..4003c767bde919 100644
--- a/chrome/browser/importer/importer_host.cc
+++ b/chrome/browser/importer/importer_host.cc
@@ -158,9 +158,9 @@ void ImporterHost::StartImportSettings(
 void ImporterHost::OnGoogleGAIACookieChecked(bool result) {
 #if defined(OS_WIN)
   if (!result) {
-    browser::ShowMessageBox(NULL,
+    chrome::ShowMessageBox(NULL,
         l10n_util::GetStringUTF16(IDS_IMPORTER_GOOGLE_LOGIN_TEXT), string16(),
-        browser::MESSAGE_BOX_TYPE_INFORMATION);
+        chrome::MESSAGE_BOX_TYPE_INFORMATION);
 
     GURL url("https://accounts.google.com/ServiceLogin");
     DCHECK(profile_);
diff --git a/chrome/browser/pepper_gtalk_message_filter.cc b/chrome/browser/pepper_gtalk_message_filter.cc
index 95a5dbaa444930..1ed1c133226a23 100644
--- a/chrome/browser/pepper_gtalk_message_filter.cc
+++ b/chrome/browser/pepper_gtalk_message_filter.cc
@@ -51,8 +51,8 @@ void PepperGtalkMessageFilter::OnTalkGetPermission(uint32 plugin_dispatcher_id,
   aura::Window* parent = ash::Shell::GetContainer(
       ash::Shell::GetActiveRootWindow(),
       ash::internal::kShellWindowId_SystemModalContainer);
-  user_response = browser::ShowMessageBox(parent, title, message,
-      browser::MESSAGE_BOX_TYPE_QUESTION) == browser::MESSAGE_BOX_RESULT_YES;
+  user_response = chrome::ShowMessageBox(parent, title, message,
+      chrome::MESSAGE_BOX_TYPE_QUESTION) == chrome::MESSAGE_BOX_RESULT_YES;
 #else
   NOTIMPLEMENTED();
 #endif
diff --git a/chrome/browser/printing/print_error_dialog.cc b/chrome/browser/printing/print_error_dialog.cc
index e1986ad4e78605..5b57b08db83939 100644
--- a/chrome/browser/printing/print_error_dialog.cc
+++ b/chrome/browser/printing/print_error_dialog.cc
@@ -11,11 +11,10 @@
 namespace chrome {
 
 void ShowPrintErrorDialog(gfx::NativeWindow parent) {
-  browser::ShowMessageBox(
-      parent,
-      l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_TITLE_TEXT),
-      l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_ERROR_TEXT),
-      browser::MESSAGE_BOX_TYPE_WARNING);
+  ShowMessageBox(parent,
+                 l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_TITLE_TEXT),
+                 l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_ERROR_TEXT),
+                 MESSAGE_BOX_TYPE_WARNING);
 }
 
 }  // namespace chrome
diff --git a/chrome/browser/process_singleton_win.cc b/chrome/browser/process_singleton_win.cc
index 0b59c7126384d3..783c9da1a62602 100644
--- a/chrome/browser/process_singleton_win.cc
+++ b/chrome/browser/process_singleton_win.cc
@@ -271,10 +271,10 @@ ProcessSingleton::NotifyResult ProcessSingleton::NotifyOtherProcess() {
                     reinterpret_cast<LPARAM>(&visible_window));
 
   // If there is a visible browser window, ask the user before killing it.
-  if (visible_window && browser::ShowMessageBox(NULL,
+  if (visible_window && chrome::ShowMessageBox(NULL,
       l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
       l10n_util::GetStringUTF16(IDS_BROWSER_HUNGBROWSER_MESSAGE),
-      browser::MESSAGE_BOX_TYPE_QUESTION) == browser::MESSAGE_BOX_RESULT_NO) {
+      chrome::MESSAGE_BOX_TYPE_QUESTION) == chrome::MESSAGE_BOX_RESULT_NO) {
     // The user denied. Quit silently.
     return PROCESS_NOTIFIED;
   }
diff --git a/chrome/browser/ui/cocoa/simple_message_box_mac.mm b/chrome/browser/ui/cocoa/simple_message_box_mac.mm
index 297943aff8c8c1..9edf2f063526dd 100644
--- a/chrome/browser/ui/cocoa/simple_message_box_mac.mm
+++ b/chrome/browser/ui/cocoa/simple_message_box_mac.mm
@@ -10,7 +10,7 @@
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
-namespace browser {
+namespace chrome {
 
 MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
                                 const string16& title,
@@ -35,4 +35,4 @@ MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
       MESSAGE_BOX_RESULT_NO : MESSAGE_BOX_RESULT_YES;
 }
 
-}  // namespace browser
+}  // namespace chrome
diff --git a/chrome/browser/ui/cocoa/tab_contents/chrome_web_contents_view_delegate_mac.mm b/chrome/browser/ui/cocoa/tab_contents/chrome_web_contents_view_delegate_mac.mm
index 1086232106774a..9e69e86f6759aa 100644
--- a/chrome/browser/ui/cocoa/tab_contents/chrome_web_contents_view_delegate_mac.mm
+++ b/chrome/browser/ui/cocoa/tab_contents/chrome_web_contents_view_delegate_mac.mm
@@ -53,11 +53,11 @@ new RenderViewContextMenuMac(web_contents_,
   context_menu_->Init();
 }
 
-namespace browser {
+namespace chrome {
 
 content::WebContentsViewDelegate* CreateWebContentsViewDelegate(
     content::WebContents* web_contents) {
   return new ChromeWebContentsViewDelegateMac(web_contents);
 }
 
-}  // namespace browser
+}  // namespace chrome
diff --git a/chrome/browser/ui/gtk/simple_message_box_gtk.cc b/chrome/browser/ui/gtk/simple_message_box_gtk.cc
index d7050624a4fbd0..703ab89e52cf18 100644
--- a/chrome/browser/ui/gtk/simple_message_box_gtk.cc
+++ b/chrome/browser/ui/gtk/simple_message_box_gtk.cc
@@ -41,7 +41,7 @@ void OnDialogResponse(GtkWidget* widget, int response, void* user_data) {
 
 }  // namespace
 
-namespace browser {
+namespace chrome {
 
 MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
                                 const string16& title,
@@ -82,4 +82,4 @@ MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
   return MESSAGE_BOX_RESULT_YES;
 }
 
-}  // namespace browser
+}  // namespace chrome
diff --git a/chrome/browser/ui/gtk/tab_contents/chrome_web_contents_view_delegate_gtk.cc b/chrome/browser/ui/gtk/tab_contents/chrome_web_contents_view_delegate_gtk.cc
index c7d7d2639da9df..30be9c1e29a7fc 100644
--- a/chrome/browser/ui/gtk/tab_contents/chrome_web_contents_view_delegate_gtk.cc
+++ b/chrome/browser/ui/gtk/tab_contents/chrome_web_contents_view_delegate_gtk.cc
@@ -179,11 +179,11 @@ void ChromeWebContentsViewDelegateGtk::OnSetFloatingPosition(
   g_value_unset(&value);
 }
 
-namespace browser {
+namespace chrome {
 
 content::WebContentsViewDelegate* CreateWebContentsViewDelegate(
     content::WebContents* web_contents) {
   return new ChromeWebContentsViewDelegateGtk(web_contents);
 }
 
-}  // namespace browser
+}  // namespace chrome
diff --git a/chrome/browser/ui/profile_error_dialog.cc b/chrome/browser/ui/profile_error_dialog.cc
index 85e9e1e957341f..851731bfe43cf6 100644
--- a/chrome/browser/ui/profile_error_dialog.cc
+++ b/chrome/browser/ui/profile_error_dialog.cc
@@ -13,9 +13,9 @@ void ShowProfileErrorDialog(int message_id) {
 #if defined(OS_ANDROID)
   NOTIMPLEMENTED();
 #else
-  browser::ShowMessageBox(NULL,
-                          l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
-                          l10n_util::GetStringUTF16(message_id),
-                          browser::MESSAGE_BOX_TYPE_WARNING);
+  chrome::ShowMessageBox(NULL,
+                         l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
+                         l10n_util::GetStringUTF16(message_id),
+                         chrome::MESSAGE_BOX_TYPE_WARNING);
 #endif
 }
diff --git a/chrome/browser/ui/simple_message_box.h b/chrome/browser/ui/simple_message_box.h
index ea6df3d23959a5..bd85403da99ab6 100644
--- a/chrome/browser/ui/simple_message_box.h
+++ b/chrome/browser/ui/simple_message_box.h
@@ -9,7 +9,7 @@
 #include "base/string16.h"
 #include "ui/gfx/native_widget_types.h"
 
-namespace browser {
+namespace chrome {
 
 enum MessageBoxResult {
   MESSAGE_BOX_RESULT_NO = 0,
@@ -35,6 +35,6 @@ MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
                                 const string16& message,
                                 MessageBoxType type);
 
-}  // namespace browser
+}  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_SIMPLE_MESSAGE_BOX_H_
diff --git a/chrome/browser/ui/tab_contents/chrome_web_contents_view_delegate.h b/chrome/browser/ui/tab_contents/chrome_web_contents_view_delegate.h
index 809c8abff99ced..b44c0481abd11c 100644
--- a/chrome/browser/ui/tab_contents/chrome_web_contents_view_delegate.h
+++ b/chrome/browser/ui/tab_contents/chrome_web_contents_view_delegate.h
@@ -8,14 +8,14 @@
 
 namespace content {
 class WebContents;
-class WebContentsViewMacDelegate;
+class WebContentsViewDelegate;
 }
 
-namespace browser {
+namespace chrome {
 
 content::WebContentsViewDelegate* CreateWebContentsViewDelegate(
     content::WebContents* web_contents);
 
-}  // namespace
+}  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_TAB_CONTENTS_CHROME_WEB_CONTENTS_VIEW_DELEGATE_H_
diff --git a/chrome/browser/ui/views/simple_message_box_views.cc b/chrome/browser/ui/views/simple_message_box_views.cc
index a3998857766e07..f87e526336650b 100644
--- a/chrome/browser/ui/views/simple_message_box_views.cc
+++ b/chrome/browser/ui/views/simple_message_box_views.cc
@@ -23,7 +23,7 @@
 #include "ui/aura/root_window.h"
 #endif
 
-namespace browser {
+namespace chrome {
 
 namespace {
 
@@ -187,4 +187,4 @@ MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
   return dialog->result();
 }
 
-}  // namespace browser
+}  // namespace chrome
diff --git a/chrome/browser/ui/views/simple_message_box_win.cc b/chrome/browser/ui/views/simple_message_box_win.cc
index e3fa44de577314..30930a9dc054a7 100644
--- a/chrome/browser/ui/views/simple_message_box_win.cc
+++ b/chrome/browser/ui/views/simple_message_box_win.cc
@@ -6,7 +6,7 @@
 
 #include "ui/base/win/message_box_win.h"
 
-namespace browser {
+namespace chrome {
 
 MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
                                 const string16& title,
@@ -20,4 +20,4 @@ MessageBoxResult ShowMessageBox(gfx::NativeWindow parent,
       MESSAGE_BOX_RESULT_NO : MESSAGE_BOX_RESULT_YES;
 }
 
-}  // namespace browser
+}  // namespace chrome
diff --git a/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc b/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc
index 53b2e3c2d21372..5815006068bed2 100644
--- a/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc
+++ b/chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc
@@ -193,11 +193,11 @@ void ChromeWebContentsViewDelegateViews::SetInitialFocus() {
   }
 }
 
-namespace browser {
+namespace chrome {
 
 content::WebContentsViewDelegate* CreateWebContentsViewDelegate(
     content::WebContents* web_contents) {
   return new ChromeWebContentsViewDelegateViews(web_contents);
 }
 
-}  // namespace browser
+}  // namespace chrome
diff --git a/chrome/browser/ui/webui/chromeos/mobile_setup_dialog.cc b/chrome/browser/ui/webui/chromeos/mobile_setup_dialog.cc
index eaaa664e973a97..cbdee9403b09da 100644
--- a/chrome/browser/ui/webui/chromeos/mobile_setup_dialog.cc
+++ b/chrome/browser/ui/webui/chromeos/mobile_setup_dialog.cc
@@ -143,10 +143,10 @@ void MobileSetupDialogDelegate::OnCloseContents(WebContents* source,
     return;
   }
 
-  *out_close_dialog = browser::ShowMessageBox(dialog_window_,
+  *out_close_dialog = chrome::ShowMessageBox(dialog_window_,
       l10n_util::GetStringUTF16(IDS_MOBILE_SETUP_TITLE),
       l10n_util::GetStringUTF16(IDS_MOBILE_CANCEL_ACTIVATION),
-      browser::MESSAGE_BOX_TYPE_QUESTION);
+      chrome::MESSAGE_BOX_TYPE_QUESTION);
 }
 
 bool MobileSetupDialogDelegate::ShouldShowDialogTitle() const {