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

chrome/browser/resources/settings/android_apps_page/android_apps_browser_proxy.js

Index: chrome/browser/resources/settings/android_apps_page/android_apps_browser_proxy.js
diff --git a/chrome/browser/resources/settings/android_apps_page/android_apps_browser_proxy.js b/chrome/browser/resources/settings/android_apps_page/android_apps_browser_proxy.js
index c5b32bd9834ce36d81f883a9a75a5be7463b7bdb..6cb17f5f63aec8a75f0de9ad1ae68764ac9001ca 100644
--- a/chrome/browser/resources/settings/android_apps_page/android_apps_browser_proxy.js
+++ b/chrome/browser/resources/settings/android_apps_page/android_apps_browser_proxy.js
@@ -21,39 +21,34 @@ 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() {}
-
-  // The singleton instance_ can be replaced with a test version of this wrapper
-  // during testing.
-  cr.addSingletonGetter(AndroidAppsBrowserProxyImpl);
-
-  AndroidAppsBrowserProxyImpl.prototype = {
+  class AndroidAppsBrowserProxyImpl {
     /** @override */
-    requestAndroidAppsInfo: function() {
+    requestAndroidAppsInfo() {
       chrome.send('requestAndroidAppsInfo');
-    },
+    }
 
     /** @override */
-    showAndroidAppsSettings: function(keyboardAction) {
+    showAndroidAppsSettings(keyboardAction) {
       chrome.send('showAndroidAppsSettings', [keyboardAction]);
-    },
-  };
+    }
+  }
+
+  // The singleton instance_ can be replaced with a test version of this wrapper
+  // during testing.
+  cr.addSingletonGetter(AndroidAppsBrowserProxyImpl);
 
   return {
     AndroidAppsBrowserProxy: AndroidAppsBrowserProxy,