switch mediaGalleries to .idl api definition

chrome/chrome_browser_extensions.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.
 
 {
   'targets': [
     {
       'target_name': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 145 matching lines @@
         'browser/extensions/api/extension_action/extension_script_badge_api.cc',
         'browser/extensions/api/extension_action/extension_script_badge_api.h',
         'browser/extensions/api/file_system/file_system_api.cc',
         'browser/extensions/api/file_system/file_system_api.h',
         'browser/extensions/api/idltest/idltest_api.cc',
         'browser/extensions/api/idltest/idltest_api.h',
         'browser/extensions/api/identity/identity_api.cc',
         'browser/extensions/api/identity/identity_api.h',
         'browser/extensions/api/identity/web_auth_flow.cc',
         'browser/extensions/api/identity/web_auth_flow.h',
-        'browser/extensions/api/media_gallery/media_gallery_api.cc',
-        'browser/extensions/api/media_gallery/media_gallery_api.h',
+        'browser/extensions/api/media_galleries/media_galleries_api.cc',
+        'browser/extensions/api/media_galleries/media_galleries_api.h',
         'browser/extensions/api/offscreen_tabs/offscreen_tabs_api.cc',
         'browser/extensions/api/offscreen_tabs/offscreen_tabs_api.h',
         'browser/extensions/api/offscreen_tabs/offscreen_tabs_constants.cc',
         'browser/extensions/api/offscreen_tabs/offscreen_tabs_constants.h',
         'browser/extensions/api/omnibox/omnibox_api.cc',
         'browser/extensions/api/omnibox/omnibox_api.h',
         'browser/extensions/api/permissions/permissions_api.cc',
         'browser/extensions/api/permissions/permissions_api.h',
         'browser/extensions/api/permissions/permissions_api_helpers.cc',
         'browser/extensions/api/permissions/permissions_api_helpers.h',
@@ skipping 536 matching lines @@
             'browser/extensions/extension_tab_util.cc',
             'browser/extensions/platform_app_launcher.cc',
             'browser/extensions/platform_app_launcher.h',
           ],
         }],
       ],
     },
   ],
 }