MD Settings: Fix editing name of default search engine.

chrome/browser/resources/settings/search_engines_page/search_engine_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-search-engine-dialog' is a component for adding
  * or editing a search engine entry.
  */
 Polymer({
   is: 'settings-search-engine-dialog',
@@ skipping 39 matching lines @@
   },
 
   /** @override */
   ready: function() {
     if (this.model) {
       this.dialogTitle_ =
           loadTimeData.getString('searchEnginesEditSearchEngine');
       this.actionButtonText_ = loadTimeData.getString('save');
 
       // If editing an existing search engine, pre-populate the input fields.
-      this.searchEngine_ = this.model.displayName;
+      this.searchEngine_ = this.model.name;
       this.keyword_ = this.model.keyword;
       this.queryUrl_ = this.model.url;
     } else {
       this.dialogTitle_ =
           loadTimeData.getString('searchEnginesAddSearchEngine');
       this.actionButtonText_ = loadTimeData.getString('add');
     }
 
     this.addEventListener('iron-overlay-canceled', function() {
       this.browserProxy_.searchEngineEditCancelled();
@@ skipping 37 matching lines @@
   /** @private */
   updateActionButtonState_: function() {
     var allValid = [
       this.$.searchEngine, this.$.keyword, this.$.queryUrl
     ].every(function(inputElement) {
       return !inputElement.invalid && inputElement.value.length != 0;
     });
     this.$.actionButton.disabled = !allValid;
   },
 });