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

chrome/browser/resources/settings/people_page/change_picture_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 "Change Picture" subpage of
  * the People section to interact with the browser. ChromeOS only.
  */
 cr.exportPath('settings');
 
 /**
  * An object describing a default image.
  * @typedef {{
  *   author: string,
  *   title: string,
  *   url: string,
  *   website: string
  * }}
  */
 settings.DefaultImage;
 
 cr.define('settings', function() {
   /** @interface */
-  function ChangePictureBrowserProxy() {}
-
-  ChangePictureBrowserProxy.prototype = {
+  class ChangePictureBrowserProxy {
     /**
      * Retrieves the initial set of default images, profile image, etc. As a
      * response, the C++ sends these WebUIListener events:
      * 'default-images-changed', 'profile-image-changed', 'old-image-changed',
      * and 'selected-image-changed'
      */
-    initialize: function() {},
+    initialize() {}
 
     /**
      * Sets the user image to one of the default images. As a response, the C++
      * sends the 'default-images-changed' WebUIListener event.
      * @param {string} imageUrl
      */
-    selectDefaultImage: function(imageUrl) {},
+    selectDefaultImage(imageUrl) {}
 
     /**
      * Sets the user image to the 'old' image. As a response, the C++ sends the
      * 'old-image-changed' WebUIListener event.
      */
-    selectOldImage: function() {},
+    selectOldImage() {}
 
     /**
      * Sets the user image to the profile image. As a response, the C++ sends
      * the 'profile-image-changed' WebUIListener event.
      */
-    selectProfileImage: function() {},
+    selectProfileImage() {}
 
     /**
      * Provides the taken photo as a data URL to the C++. No response is
      * expected.
      * @param {string} photoDataUrl
      */
-    photoTaken: function(photoDataUrl) {},
+    photoTaken(photoDataUrl) {}
 
     /**
      * Requests a file chooser to select a new user image. No response is
      * expected.
      */
-    chooseFile: function() {},
-  };
+    chooseFile() {}
+  }
 
   /**
-   * @constructor
    * @implements {settings.ChangePictureBrowserProxy}
    */
-  function ChangePictureBrowserProxyImpl() {}
+  class ChangePictureBrowserProxyImpl {
+    /** @override */
+    initialize() {
+      chrome.send('onChangePicturePageInitialized');
+    }
+
+    /** @override */
+    selectDefaultImage(imageUrl) {
+      chrome.send('selectImage', [imageUrl, 'default']);
+    }
+
+    /** @override */
+    selectOldImage() {
+      chrome.send('selectImage', ['', 'old']);
+    }
+
+    /** @override */
+    selectProfileImage() {
+      chrome.send('selectImage', ['', 'profile']);
+    }
+
+    /** @override */
+    photoTaken(photoDataUrl) {
+      chrome.send('photoTaken', [photoDataUrl]);
+    }
+
+    /** @override */
+    chooseFile() {
+      chrome.send('chooseFile');
+    }
+  }
+
   // The singleton instance_ is replaced with a test version of this wrapper
   // during testing.
   cr.addSingletonGetter(ChangePictureBrowserProxyImpl);
 
-  ChangePictureBrowserProxyImpl.prototype = {
-    /** @override */
-    initialize: function() {
-      chrome.send('onChangePicturePageInitialized');
-    },
-
-    /** @override */
-    selectDefaultImage: function(imageUrl) {
-      chrome.send('selectImage', [imageUrl, 'default']);
-    },
-
-    /** @override */
-    selectOldImage: function() {
-      chrome.send('selectImage', ['', 'old']);
-    },
-
-    /** @override */
-    selectProfileImage: function() {
-      chrome.send('selectImage', ['', 'profile']);
-    },
-
-    /** @override */
-    photoTaken: function(photoDataUrl) {
-      chrome.send('photoTaken', [photoDataUrl]);
-    },
-
-    /** @override */
-    chooseFile: function() {
-      chrome.send('chooseFile');
-    },
-  };
-
   return {
     ChangePictureBrowserProxy: ChangePictureBrowserProxy,
     ChangePictureBrowserProxyImpl: ChangePictureBrowserProxyImpl,
   };
 });