<webview>: Partially migrate loadcommit event from content to chrome

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 497 matching lines @@
         'browser/extensions/api/web_request/web_request_permissions.cc',
         'browser/extensions/api/web_request/web_request_permissions.h',
         'browser/extensions/api/web_request/web_request_time_tracker.cc',
         'browser/extensions/api/web_request/web_request_time_tracker.h',
         'browser/extensions/api/web_socket_proxy_private/web_socket_proxy_private_api.cc',
         'browser/extensions/api/web_socket_proxy_private/web_socket_proxy_private_api.h',
         'browser/extensions/api/webstore_private/webstore_private_api.cc',
         'browser/extensions/api/webstore_private/webstore_private_api.h',
         'browser/extensions/api/webview/webview_api.cc',
         'browser/extensions/api/webview/webview_api.h',
+        'browser/extensions/api/webview/webview_api_constants.cc',
+        'browser/extensions/api/webview/webview_api_constants.h',
         'browser/extensions/app_icon_loader.h',
         'browser/extensions/app_icon_loader_impl.cc',
         'browser/extensions/app_icon_loader_impl.h',
         'browser/extensions/app_sync_bundle.cc',
         'browser/extensions/app_sync_bundle.h',
         'browser/extensions/app_sync_data.cc',
         'browser/extensions/app_sync_data.h',
         'browser/extensions/app_window_contents.cc',
         'browser/extensions/app_window_contents.h',
         'browser/extensions/blacklist.cc',
@@ skipping 463 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/chromeos/contacts',
             'proto_out_dir': 'chrome/browser/chromeos/contacts',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],  # 'chromeos=1'
   ],  # 'conditions'
 }