MD Settings: change confirm text to save startup url's dialog.

chrome/browser/resources/settings/on_startup_page/startup_url_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-startup-url-dialog' is a component for adding
  * or editing a startup URL entry.
  */
 Polymer({
   is: 'settings-startup-url-dialog',
@@ skipping 18 matching lines @@
 
   /** @private {!settings.SearchEnginesBrowserProxy} */
   browserProxy_: null,
 
   /** @override */
   attached: function() {
     this.browserProxy_ = settings.StartupUrlsPageBrowserProxyImpl.getInstance();
 
     if (this.model) {
       this.dialogTitle_ = loadTimeData.getString('onStartupEditPage');
-      this.actionButtonText_ = loadTimeData.getString('edit');
+      this.actionButtonText_ = loadTimeData.getString('save');
       this.$.actionButton.disabled = false;
       // Pre-populate the input field.
       this.url_ = this.model.url;
     } else {
       this.dialogTitle_ = loadTimeData.getString('onStartupAddNewPage');
       this.actionButtonText_ = loadTimeData.getString('add');
       this.$.actionButton.disabled = true;
     }
     this.$.dialog.showModal();
   },
@@ skipping 26 matching lines @@
       this.onActionButtonTap_();
   },
 
   /** @private */
   validate_: function() {
     this.browserProxy_.validateStartupPage(this.url_).then(function(isValid) {
       this.$.actionButton.disabled = !isValid;
     }.bind(this));
   },
 });