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

chrome/browser/resources/settings/about_page/about_page.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-about-page' contains version and OS related
  * information.
  */
 
 Polymer({
@@ skipping 118 matching lines @@
 
   /** @override */
   attached: function() {
     this.aboutBrowserProxy_ = settings.AboutPageBrowserProxyImpl.getInstance();
     this.aboutBrowserProxy_.pageReady();
 
     this.lifetimeBrowserProxy_ =
         settings.LifetimeBrowserProxyImpl.getInstance();
 
     // <if expr="chromeos">
-    this.addEventListener('target-channel-changed', function(e) {
+    this.addEventListener('target-channel-changed', e => {
       this.targetChannel_ = e.detail;
-    }.bind(this));
+    });
 
-    this.aboutBrowserProxy_.getChannelInfo().then(function(info) {
+    this.aboutBrowserProxy_.getChannelInfo().then(info => {
       this.currentChannel_ = info.currentChannel;
       this.targetChannel_ = info.targetChannel;
       this.startListening_();
-    }.bind(this));
+    });
 
-    this.aboutBrowserProxy_.getRegulatoryInfo().then(function(info) {
+    this.aboutBrowserProxy_.getRegulatoryInfo().then(info => {
       this.regulatoryInfo_ = info;
-    }.bind(this));
+    });
     // </if>
     // <if expr="not chromeos">
     this.startListening_();
     // </if>
     if (settings.getQueryParameters().get('checkForUpdate') == 'true') {
       this.onCheckUpdatesTap_();
     }
   },
 
   /** @private */
@@ skipping 295 matching lines @@
         });
   },
 
   // <if expr="_google_chrome">
   /** @private */
   onReportIssueTap_: function() {
     this.aboutBrowserProxy_.openFeedbackDialog();
   },
   // </if>
 });