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

chrome/browser/resources/settings/device_page/layout_behavior.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 Behavior for handling display layout, specifically
  *     edge snapping and collisions.
  */
 
 /** @polymerBehavior */
@@ skipping 275 matching lines @@
   },
 
   /**
    * @param {string} parentId
    * @param {boolean} recurse Include descendants of children.
    * @return {!Array<string>}
    * @private
    */
   findChildren_: function(parentId, recurse) {
     var children = [];
-    this.displayLayoutMap_.forEach(function(value, key) {
+    this.displayLayoutMap_.forEach((value, key) => {
       var childId = key;
       if (childId != parentId && value.parentId == parentId) {
         // Insert immediate children at the front of the array.
         children.unshift(childId);
         if (recurse) {
           // Descendants get added to the end of the list.
           children = children.concat(this.findChildren_(childId, true));
         }
       }
-    }.bind(this));
+    });
     return children;
   },
 
   /**
    * Recursively calculates the absolute bounds of a display.
    * Caches the display bounds so that parent bounds are only calculated once.
    * @param {string} id
    * @param {number} width
    * @param {number} height
    * @private
@@ skipping 388 matching lines @@
           highlight == chrome.system.display.LayoutPosition.LEFT);
       div.classList.toggle(
           'highlight-top',
           highlight == chrome.system.display.LayoutPosition.TOP);
       div.classList.toggle(
           'highlight-bottom',
           highlight == chrome.system.display.LayoutPosition.BOTTOM);
     }
   },
 };