MD Settings: Convert all usages of .bind(this) to use ES6 arrow function.

chrome/browser/resources/settings/device_page/storage.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
  * 'settings-storage' is the settings subpage for storage settings.
  */
 cr.exportPath('settings');
 
@@ skipping 228 matching lines @@
     this.androidEnabled_ = enabled;
   },
 
   /**
    * Starts periodic update for storage usage.
    * @private
    */
   startPeriodicUpdate_: function() {
     // We update the storage usage every 5 seconds.
     if (this.updateTimerId_ == -1) {
-      this.updateTimerId_ = window.setInterval(function() {
+      this.updateTimerId_ = window.setInterval(() => {
         if (settings.getCurrentRoute() != settings.routes.STORAGE) {
           this.stopPeriodicUpdate_();
           return;
         }
         chrome.send('updateStorageInfo');
-      }.bind(this), 5000);
+      }, 5000);
     }
   },
 
   /**
    * Stops periodic update for storage usage.
    * @private
    */
   stopPeriodicUpdate_: function() {
     if (this.updateTimerId_ != -1) {
       window.clearInterval(this.updateTimerId_);
@@ skipping 36 matching lines @@
       default:
         return '';
     }
   },
 
   /** @private */
   onCloseDriveCacheDialog_: function() {
     cr.ui.focusWithoutInk(assert(this.$$('#deleteButton')));
   },
 });