Enable extension APIs for content scripts.

chrome/chrome_common.gypi

 # Copyright (c) 2011 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': 'common',
       'type': 'static_library',
       'variables': {
@@ skipping 123 matching lines @@
         'common/extensions/file_browser_handler.cc',
         'common/extensions/file_browser_handler.h',
         'common/extensions/update_manifest.cc',
         'common/extensions/update_manifest.h',
         'common/extensions/url_pattern.cc',
         'common/extensions/url_pattern.h',
         'common/extensions/url_pattern_set.cc',
         'common/extensions/url_pattern_set.h',
         'common/extensions/user_script.cc',
         'common/extensions/user_script.h',
+        'common/extensions/api/extension_api.cc',
+        'common/extensions/api/extension_api.h',
         'common/external_ipc_fuzzer.h',
         'common/external_ipc_fuzzer.cc',
         'common/favicon_url.cc',
         'common/favicon_url.h',
         'common/guid.cc',
         'common/guid.h',
         'common/guid_posix.cc',
         'common/guid_win.cc',
         'common/icon_messages.h',
         'common/important_file_writer.cc',
@@ skipping 275 matching lines @@
         'common/safe_browsing/csd.proto'
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',
         'proto_out_dir': 'chrome/common/safe_browsing',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }