Add gn implementation of //ios/public/provider/chrome/browser.

BUG=459705

Review URL: https://codereview.chromium.org/1445623002

Cr-Commit-Position: refs/heads/master@{#360085}

BUILD.gn

@@ -205,6 +205,7 @@ group("both_gn_and_gyp") {
   } else {
     deps += [
       "//ios/net:ios_net_unittests",
+      "//ios/public/provider/chrome/browser",
       "//ios/public/provider/web",
       "//ios/testing:ocmock_support_unittest",
       "//ios/web/shell:ios_web_shell",

ios/provider/ios_provider_chrome.gyp

@@ -7,6 +7,7 @@
    },
   'targets': [
     {
+      # GN version: //ios/public/provider/chrome/browser
       'target_name': 'ios_provider_chrome_browser',
       'type': 'static_library',
       'sources': [

ios/public/provider/chrome/browser/BUILD.gn

@@ -0,0 +1,35 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("browser") {
+  sources = [
+    "browser_state/chrome_browser_state.cc",
+    "browser_state/chrome_browser_state.h",
+    "browser_state/chrome_browser_state_manager.h",
+    "chrome_browser_provider.cc",
+    "chrome_browser_provider.h",
+    "geolocation_updater_provider.h",
+    "geolocation_updater_provider.mm",
+    "keyed_service_provider.cc",
+    "keyed_service_provider.h",
+    "signin/chrome_identity.h",
+    "signin/chrome_identity.mm",
+    "signin/chrome_identity_service.h",
+    "signin/chrome_identity_service.mm",
+    "signin/signin_error_provider.h",
+    "signin/signin_error_provider.mm",
+    "string_provider.h",
+    "ui/infobar_view_delegate.h",
+    "ui/infobar_view_protocol.h",
+    "updatable_resource_provider.h",
+    "updatable_resource_provider.mm",
+  ]
+
+  deps = [
+    "//base",
+    "//components/autofill/core/browser",
+    "//ios/public/provider/web",
+    "//ios/web",
+  ]
+}