diff --git a/net/base/network_change_notifier_linux.h b/net/base/network_change_notifier_linux.h
index 2a4b20b07d22..89b054559d23 100644
--- a/net/base/network_change_notifier_linux.h
+++ b/net/base/network_change_notifier_linux.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/network_change_notifier.h"
 
@@ -22,7 +23,7 @@ class NetworkChangeNotifierLinux : public NetworkChangeNotifier {
   virtual ~NetworkChangeNotifierLinux();
 
   // NetworkChangeNotifier:
-  virtual bool IsCurrentlyOffline() const;
+  virtual bool IsCurrentlyOffline() const OVERRIDE;
 
   // The thread used to listen for notifications.  This relays the notification
   // to the registered observers without posting back to the thread the object
diff --git a/net/base/network_change_notifier_mac.h b/net/base/network_change_notifier_mac.h
index 0f68e86e2275..54ca27d0797f 100644
--- a/net/base/network_change_notifier_mac.h
+++ b/net/base/network_change_notifier_mac.h
@@ -9,6 +9,7 @@
 #include <SystemConfiguration/SystemConfiguration.h>
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/condition_variable.h"
@@ -24,7 +25,7 @@ class NetworkChangeNotifierMac: public NetworkChangeNotifier {
   virtual ~NetworkChangeNotifierMac();
 
   // NetworkChangeNotifier implementation:
-  virtual bool IsCurrentlyOffline() const;
+  virtual bool IsCurrentlyOffline() const OVERRIDE;
 
  private:
   enum OnlineState {
@@ -41,13 +42,14 @@ class NetworkChangeNotifierMac: public NetworkChangeNotifier {
         : net_config_watcher_(net_config_watcher) {}
 
     // NetworkConfigWatcherMac::Delegate implementation:
-    virtual void Init() {
+    virtual void Init() OVERRIDE {
       net_config_watcher_->SetInitialState();
     }
-    virtual void SetDynamicStoreNotificationKeys(SCDynamicStoreRef store) {
+    virtual void SetDynamicStoreNotificationKeys(
+        SCDynamicStoreRef store) OVERRIDE {
       net_config_watcher_->SetDynamicStoreNotificationKeys(store);
     }
-    virtual void OnNetworkConfigChange(CFArrayRef changed_keys) {
+    virtual void OnNetworkConfigChange(CFArrayRef changed_keys) OVERRIDE {
       net_config_watcher_->OnNetworkConfigChange(changed_keys);
     }
 
diff --git a/net/base/network_config_watcher_mac.cc b/net/base/network_config_watcher_mac.cc
index be399f9ef235..7c6324069432 100644
--- a/net/base/network_config_watcher_mac.cc
+++ b/net/base/network_config_watcher_mac.cc
@@ -6,10 +6,12 @@
 
 #include <algorithm>
 
+#include "base/bind.h"
 #include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "base/message_loop.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
-#include "base/mac/scoped_cftyperef.h"
 
 namespace net {
 
@@ -31,8 +33,8 @@ class NetworkConfigWatcherMacThread : public base::Thread {
 
  protected:
   // base::Thread
-  virtual void Init();
-  virtual void CleanUp();
+  virtual void Init() OVERRIDE;
+  virtual void CleanUp() OVERRIDE;
 
  private:
   // The SystemConfiguration calls in this function can lead to contention early
@@ -41,7 +43,7 @@ class NetworkConfigWatcherMacThread : public base::Thread {
 
   base::mac::ScopedCFTypeRef<CFRunLoopSourceRef> run_loop_source_;
   NetworkConfigWatcherMac::Delegate* const delegate_;
-  ScopedRunnableMethodFactory<NetworkConfigWatcherMacThread> method_factory_;
+  base::WeakPtrFactory<NetworkConfigWatcherMacThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkConfigWatcherMacThread);
 };
@@ -50,7 +52,7 @@ NetworkConfigWatcherMacThread::NetworkConfigWatcherMacThread(
     NetworkConfigWatcherMac::Delegate* delegate)
     : base::Thread("NetworkConfigWatcher"),
       delegate_(delegate),
-      ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {}
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {}
 
 NetworkConfigWatcherMacThread::~NetworkConfigWatcherMacThread() {
   // Allow IO because Stop() calls PlatformThread::Join(), which is a blocking
@@ -72,8 +74,8 @@ void NetworkConfigWatcherMacThread::Init() {
   const int kInitializationDelayMS = 1000;
   message_loop()->PostDelayedTask(
       FROM_HERE,
-      method_factory_.NewRunnableMethod(
-          &NetworkConfigWatcherMacThread::InitNotifications),
+      base::Bind(&NetworkConfigWatcherMacThread::InitNotifications,
+                 weak_factory_.GetWeakPtr()),
       kInitializationDelayMS);
 }
 
diff --git a/net/base/network_config_watcher_mac.h b/net/base/network_config_watcher_mac.h
index 7658438a0fe3..5066e65aff6d 100644
--- a/net/base/network_config_watcher_mac.h
+++ b/net/base/network_config_watcher_mac.h
@@ -8,7 +8,6 @@
 #include <SystemConfiguration/SCDynamicStore.h>
 
 #include "base/basictypes.h"
-#include "base/message_loop.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
 
@@ -18,7 +17,7 @@ class Thread;
 
 namespace net {
 
-// Base class for watching the Mac OS system network settings.
+// Helper class for watching the Mac OS system network settings.
 class NetworkConfigWatcherMac {
  public:
   // NOTE: The lifetime of Delegate is expected to exceed the lifetime of
@@ -42,7 +41,7 @@ class NetworkConfigWatcherMac {
   };
 
   explicit NetworkConfigWatcherMac(Delegate* delegate);
-  virtual ~NetworkConfigWatcherMac();
+  ~NetworkConfigWatcherMac();
 
  private:
   // The thread used to listen for notifications.  This relays the notification
diff --git a/net/proxy/proxy_config_service_mac.cc b/net/proxy/proxy_config_service_mac.cc
index df26466a6d21..2fd6ee00af68 100644
--- a/net/proxy/proxy_config_service_mac.cc
+++ b/net/proxy/proxy_config_service_mac.cc
@@ -10,6 +10,7 @@
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
+#include "base/message_loop.h"
 #include "base/sys_string_conversions.h"
 #include "net/base/net_errors.h"
 #include "net/proxy/proxy_config.h"
diff --git a/net/proxy/proxy_config_service_mac.h b/net/proxy/proxy_config_service_mac.h
index 493e6a2f411c..a38a0b6ee3e3 100644
--- a/net/proxy/proxy_config_service_mac.h
+++ b/net/proxy/proxy_config_service_mac.h
@@ -15,6 +15,8 @@
 #include "net/proxy/proxy_config.h"
 #include "net/proxy/proxy_config_service.h"
 
+class MessageLoop;
+
 namespace net {
 
 class ProxyConfigServiceMac : public ProxyConfigService {