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

chrome/browser/resources/settings/people_page/people_page.js

 // Copyright 2015 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-people-page' is the settings page containing sign-in settings.
  */
 Polymer({
   is: 'settings-people-page',
@@ skipping 145 matching lines @@
         settings.getCurrentRoute() == settings.routes.IMPORT_DATA;
 
     if (settings.getCurrentRoute() == settings.routes.SIGN_OUT) {
       // If the sync status has not been fetched yet, optimistically display
       // the disconnect dialog. There is another check when the sync status is
       // fetched. The dialog will be closed then the user is not signed in.
       if (this.syncStatus && !this.syncStatus.signedIn) {
         settings.navigateToPreviousRoute();
       } else {
         this.showDisconnectDialog_ = true;
-        this.async(function() {
+        this.async(() => {
           this.$$('#disconnectDialog').showModal();
-        }.bind(this));
+        });
       }
     } else if (this.showDisconnectDialog_) {
       this.$$('#disconnectDialog').close();
     }
   },
 
   // <if expr="chromeos">
   /** @private */
   getPasswordState_: function(hasPin, enableScreenLock) {
     if (!enableScreenLock)
@@ skipping 105 matching lines @@
 
   /** @private */
   onDisconnectConfirm_: function() {
     var deleteProfile = !!this.syncStatus.domain || this.deleteProfile_;
     // Trigger the sign out event after the navigateToPreviousRoute().
     // So that the navigation to the setting page could be finished before the
     // sign out if navigateToPreviousRoute() returns synchronously even the
     // browser is closed after the sign out. Otherwise, the navigation will be
     // finshed during session restore if the browser is closed before the async
     // callback executed.
-    listenOnce(this, 'signout-dialog-closed', function() {
+    listenOnce(this, 'signout-dialog-closed', () => {
       this.syncBrowserProxy_.signOut(deleteProfile);
-    }.bind(this));
+    });
 
     this.$$('#disconnectDialog').close();
   },
 
   /** @private */
   onSyncTap_: function() {
     assert(this.syncStatus.signedIn);
     assert(this.syncStatus.syncSystemEnabled);
 
     if (!this.isSyncStatusActionable_(this.syncStatus))
@@ skipping 156 matching lines @@
 
   /**
    * @param {!settings.SyncStatus} syncStatus
    * @return {boolean} Whether to show the "Sign in to Chrome" button.
    * @private
    */
   showSignin_: function(syncStatus) {
     return !!syncStatus.signinAllowed && !syncStatus.signedIn;
   },
 });