MD Settings: Eliminate use of ES6 for Chrome OS

chrome/browser/resources/settings/device_page/display_layout.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
  * 'display-layout' presents a visual representation of the layout of one or
  * more displays and allows them to be arranged.
  */
 
@@ skipping 74 matching lines @@
     var display = this.displays[0];
     var bounds = this.getCalculatedDisplayBounds(display.id);
     var boundsBoundingBox = {
       left: bounds.left,
       right: bounds.left + bounds.width,
       top: bounds.top,
       bottom: bounds.top + bounds.height,
     };
     var maxWidth = bounds.width;
     var maxHeight = bounds.height;
-    for (let i = 1; i < this.displays.length; ++i) {
+    for (var i = 1; i < this.displays.length; ++i) {
       display = this.displays[i];
       bounds = this.getCalculatedDisplayBounds(display.id);
       boundsBoundingBox.left = Math.min(boundsBoundingBox.left, bounds.left);
       boundsBoundingBox.right =
           Math.max(boundsBoundingBox.right, bounds.left + bounds.width);
       boundsBoundingBox.top = Math.min(boundsBoundingBox.top, bounds.top);
       boundsBoundingBox.bottom =
           Math.max(boundsBoundingBox.bottom, bounds.top + bounds.height);
       maxWidth = Math.max(maxWidth, bounds.width);
       maxHeight = Math.max(maxHeight, bounds.height);
@@ skipping 43 matching lines @@
     if (!bounds)
       return '';
     var height = Math.round(bounds.height * this.visualScale) - BORDER * 2 -
         MARGIN * 2 - PADDING * 2;
     var width = Math.round(bounds.width * this.visualScale) - BORDER * 2 -
         MARGIN * 2 - PADDING * 2;
     var left = OFFSET +
         Math.round(this.visualOffset_.left + (bounds.left * this.visualScale));
     var top = OFFSET +
         Math.round(this.visualOffset_.top + (bounds.top * this.visualScale));
-    return `height: ${height}px; width: ${width}px;` +
-        ` left: ${left}px; top: ${top}px`;
+    return 'height: ' + height + 'px; width: ' + width + 'px;' +
+        ' left: ' + left + 'px; top: ' + top + 'px';
   },
 
   /**
    * @param {string} id
    * @param {!chrome.system.display.Bounds} displayBounds
    * @param {number} visualScale
    * @return {string} The style string for the mirror div.
    * @private
    */
   getMirrorDivStyle_: function(id, displayBounds, visualScale) {
@@ skipping 53 matching lines @@
     var top =
         this.visualOffset_.top + Math.round(newBounds.top * this.visualScale);
     var div = this.$$('#_' + id);
     div.style.left = '' + left + 'px';
     div.style.top = '' + top + 'px';
   },
 
 });
 
 })();