MD Settings: Convert all browser proxies to use ES6 class syntax.

chrome/browser/resources/settings/android_apps_page/android_apps_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 by the "Google Play Store" (ARC) section
  * to retrieve information about android apps.
  */
 
 /**
  * Type definition of AndroidAppsInfo entry. |playStoreEnabled| indicates that
  * Play Store is enabled. |settingsAppAvailable| indicates that Android settings
  * app is registered in the system.
  * @typedef {{
  *   playStoreEnabled: boolean,
  *   settingsAppAvailable: boolean,
  * }}
  * @see chrome/browser/ui/webui/settings/chromeos/android_apps_handler.cc
  */
 var AndroidAppsInfo;
 
 cr.define('settings', function() {
   /** @interface */
-  function AndroidAppsBrowserProxy() {}
-
-  AndroidAppsBrowserProxy.prototype = {
-    requestAndroidAppsInfo: function() {},
+  class AndroidAppsBrowserProxy {
+    requestAndroidAppsInfo() {}
 
     /**
      * @param {boolean} keyboardAction True if the app was opened using a
      *     keyboard action.
      */
-    showAndroidAppsSettings: function(keyboardAction) {},
-  };
+    showAndroidAppsSettings(keyboardAction) {}
+  }
 
   /**
-   * @constructor
    * @implements {settings.AndroidAppsBrowserProxy}
    */
-  function AndroidAppsBrowserProxyImpl() {}
+  class AndroidAppsBrowserProxyImpl {
+    /** @override */
+    requestAndroidAppsInfo() {
+      chrome.send('requestAndroidAppsInfo');
+    }
+
+    /** @override */
+    showAndroidAppsSettings(keyboardAction) {
+      chrome.send('showAndroidAppsSettings', [keyboardAction]);
+    }
+  }
 
   // The singleton instance_ can be replaced with a test version of this wrapper
   // during testing.
   cr.addSingletonGetter(AndroidAppsBrowserProxyImpl);
 
-  AndroidAppsBrowserProxyImpl.prototype = {
-    /** @override */
-    requestAndroidAppsInfo: function() {
-      chrome.send('requestAndroidAppsInfo');
-    },
-
-    /** @override */
-    showAndroidAppsSettings: function(keyboardAction) {
-      chrome.send('showAndroidAppsSettings', [keyboardAction]);
-    },
-  };
-
   return {
     AndroidAppsBrowserProxy: AndroidAppsBrowserProxy,
     AndroidAppsBrowserProxyImpl: AndroidAppsBrowserProxyImpl,
   };
 });