switch mediaGalleries to .idl api definition

chrome/chrome_tests.gypi

 # Copyright (c) 2012 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 2726 matching lines @@
         'browser/extensions/api/dns/mock_host_resolver_creator.cc',
         'browser/extensions/api/dns/mock_host_resolver_creator.h',
         'browser/extensions/api/extension_action/browser_action_apitest.cc',
         'browser/extensions/api/extension_action/page_action_apitest.cc',
         'browser/extensions/api/extension_action/page_as_browser_action_apitest.cc',
         'browser/extensions/api/extension_action/script_badge_apitest.cc',
         'browser/extensions/api/file_system/file_system_apitest.cc',
         'browser/extensions/api/identity/identity_apitest.cc',
         'browser/extensions/api/idltest/idltest_apitest.cc',
         'browser/extensions/api/managed_mode/managed_mode_apitest.cc',
-        'browser/extensions/api/media_gallery/media_gallery_apitest.cc',
+        'browser/extensions/api/media_galleries/media_galleries_apitest.cc',
         'browser/extensions/api/metrics/metrics_apitest.cc',
         'browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc',
         'browser/extensions/api/omnibox/omnibox_apitest.cc',
         'browser/extensions/api/page_capture/page_capture_apitest.cc',
         'browser/extensions/api/permissions/permissions_apitest.cc',
         'browser/extensions/api/proxy/proxy_apitest.cc',
         'browser/extensions/api/record/record_api_test.cc',
         'browser/extensions/api/runtime/runtime_apitest.cc',
         'browser/extensions/api/serial/serial_apitest.cc',
         'browser/extensions/api/socket/socket_apitest.cc',
@@ skipping 1931 matching lines @@
             'input_jars_paths': [
               '<(PRODUCT_DIR)/lib.java/chromium_base.jar',
              ],
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],  # 'conditions'
 }