move openMediaGalleryManager fn out of experimental.

chrome/common/extensions/docs/js/api_page_generator.js

 // 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.
 
 /**
  * @fileoverview This file is the controller for generating extension
  * doc pages.
  *
  * It expects to have available via XHR (relative path):
  *   1) API_TEMPLATE which is the main template for the api pages.
@@ skipping 47 matching lines @@
   '../../api/file_browser_private.json',
   '../../api/file_system.json',  // autogenerated
   '../../api/font_settings.json',
   '../../api/history.json',
   '../../api/i18n.json',
   '../../api/idle.json',
   '../../api/input_ime.json',
   '../../api/input_method_private.json',
   '../../api/managed_mode_private.json',
   '../../api/management.json',
+  '../../api/media_galleries.json',  // autogenerated
   '../../api/media_player_private.json',
   '../../api/metrics_private.json',
   '../../api/omnibox.json',
   '../../api/page_action.json',
   '../../api/page_actions.json',
   '../../api/page_capture.json',
   '../../api/permissions.json',
   '../../api/privacy.json',
   '../../api/proxy.json',
   '../../api/runtime.json',
@@ skipping 775 matching lines @@
   }
   if (a.name > b.name) {
     return 1;
   }
   return 0;
 }
 
 function disableDocs(obj) {
   return !!obj.nodoc;
 }