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

chrome/browser/resources/settings/animation/animation.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 Simplified API wrapping native Web Animations with some sugar.
  * A compromise between the draft spec and Chrome's evolving support. This API
  * will be changed (or removed) as Chrome support evolves.
  */
 cr.define('settings.animation', function() {
@@ skipping 62 matching lines @@
     cancel: function() {
       assert(this.animation_);
       this.animation_.cancel();
     },
 
     /**
      * @param {!Event} e
      * @private
      */
     queueDispatch_: function(e) {
-      setTimeout(function() {
+      setTimeout(() => {
         this.dispatchEvent(e);
         this.animation_ = undefined;
-      }.bind(this));
+      });
     },
   };
 
   return {
     Animation: Animation,
     Timing: Timing,
   };
 });