Settings: Fix some BrowserProxy compile issues.

chrome/browser/resources/settings/people_page/sync_browser_proxy.js

 // Copyright 2016 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 A helper object used from the the People section to get the
  * status of the sync backend and user preferences on what data to sync. Used
  * for both Chrome browser and ChromeOS.
  */
 cr.exportPath('settings');
@@ skipping 132 matching lines @@
     setSyncEncryption: function(syncPrefs) {},
 
     /**
      * Opens the Google Activity Controls url in a new tab.
      */
     openActivityControlsUrl: function() {},
   };
 
   /**
    * @constructor
-   * @implements {SyncBrowserProxy}
+   * @implements {settings.SyncBrowserProxy}
    */
   function SyncBrowserProxyImpl() {}
   cr.addSingletonGetter(SyncBrowserProxyImpl);
 
   SyncBrowserProxyImpl.prototype = {
 <if expr="not chromeos">
     /** @override */
     startSignIn: function() {
       // TODO(tommycli): Currently this is always false, but this will become
       // a parameter once supervised users are implemented in MD Settings.
@@ skipping 41 matching lines @@
 
     /** @override */
     openActivityControlsUrl: function() {
       chrome.metricsPrivate.recordUserAction(
           'Signin_AccountSettings_GoogleActivityControlsClicked');
       window.open(loadTimeData.getString('activityControlsUrl'));
     }
   };
 
   return {
+    SyncBrowserProxy: SyncBrowserProxy,
     SyncBrowserProxyImpl: SyncBrowserProxyImpl,
   };
 });