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

chrome/browser/resources/settings/people_page/import_data_dialog.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-import-data-dialog' is a component for importing
  * bookmarks and other data from other sources.
  */
 Polymer({
   is: 'settings-import-data-dialog',
@@ skipping 35 matching lines @@
   observers: [
     'prefsChanged_(selected_, prefs.*)',
   ],
 
   /** @private {?settings.ImportDataBrowserProxy} */
   browserProxy_: null,
 
   /** @override */
   attached: function() {
     this.browserProxy_ = settings.ImportDataBrowserProxyImpl.getInstance();
-    this.browserProxy_.initializeImportDialog().then(
-        /** @param {!Array<!settings.BrowserProfile>} data */
-        function(data) {
-          this.browserProfiles_ = data;
-          this.selected_ = this.browserProfiles_[0];
+    this.browserProxy_.initializeImportDialog().then(data => {
+      this.browserProfiles_ = data;
+      this.selected_ = this.browserProfiles_[0];
 
-          // Show the dialog only after the browser profiles data is populated
-          // to avoid UI flicker.
-          this.$.dialog.showModal();
-        }.bind(this));
+      // Show the dialog only after the browser profiles data is populated
+      // to avoid UI flicker.
+      this.$.dialog.showModal();
+    });
 
-    this.addWebUIListener(
-        'import-data-status-changed',
-        /** @param {settings.ImportDataStatus} importStatus */
-        function(importStatus) {
-          this.importStatus_ = importStatus;
-          if (this.hasImportStatus_(settings.ImportDataStatus.FAILED))
-            this.closeDialog_();
-        }.bind(this));
+    this.addWebUIListener('import-data-status-changed', importStatus => {
+      this.importStatus_ = importStatus;
+      if (this.hasImportStatus_(settings.ImportDataStatus.FAILED))
+        this.closeDialog_();
+    });
   },
 
   /** @private */
   prefsChanged_: function() {
     this.noImportDataTypeSelected_ =
         !(this.getPref('import_dialog_history').value &&
           this.selected_.history) &&
         !(this.getPref('import_dialog_bookmarks').value &&
           this.selected_.favorites) &&
         !(this.getPref('import_dialog_saved_passwords').value &&
@@ skipping 49 matching lines @@
 
   /**
    * @return {boolean} Whether the import button should be disabled.
    * @private
    */
   shouldDisableImport_: function() {
     return this.hasImportStatus_(settings.ImportDataStatus.IN_PROGRESS) ||
         this.noImportDataTypeSelected_;
   },
 });