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

chrome/browser/resources/settings/basic_page/basic_page.js

Index: chrome/browser/resources/settings/basic_page/basic_page.js
diff --git a/chrome/browser/resources/settings/basic_page/basic_page.js b/chrome/browser/resources/settings/basic_page/basic_page.js
index d2c1e42107a74ccd36016b36fa190167ce9668f9..4f001f7530bbeeb75c6e2ba1dcb9f79aefed9080 100644
--- a/chrome/browser/resources/settings/basic_page/basic_page.js
+++ b/chrome/browser/resources/settings/basic_page/basic_page.js
@@ -99,9 +99,9 @@ Polymer({
   attached: function() {
     this.currentRoute_ = settings.getCurrentRoute();
 
-    this.addEventListener('chrome-cleanup-dismissed', function(e) {
+    this.addEventListener('chrome-cleanup-dismissed', e => {
       this.showChromeCleanup = false;
-    }.bind(this));
+    });
 
     if (settings.AndroidAppsBrowserProxyImpl) {
       cr.addWebUIListener(
@@ -247,9 +247,9 @@ Polymer({
    */
   advancedToggleExpandedChanged_: function() {
     if (this.advancedToggleExpanded) {
-      this.async(function() {
+      this.async(() => {
         this.$$('#advancedPageTemplate').get();
-      }.bind(this));
+      });
     }
   },