MD Settings: Fix Reset profile dialog scenario that causes a crash.

chrome/browser/resources/settings/reset_page/reset_profile_dialog.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-reset-profile-dialog' is the dialog shown for clearing profile
  * settings.
  */
 Polymer({
@@ skipping 32 matching lines @@
   onCancelTap_: function() {
     this.$.dialog.cancel();
   },
 
   /** @private */
   onResetTap_: function() {
     this.clearingInProgress_ = true;
     this.browserProxy_.performResetProfileSettings(
         this.$.sendSettings.checked).then(function() {
       this.clearingInProgress_ = false;
-      this.$.dialog.close();
+      if (this.$.dialog.open)
+        this.$.dialog.close();
       this.dispatchEvent(new CustomEvent('reset-done'));

[Dan Beam, 2016/09/15 21:15:40]

why isn't this |this.fire('reset-done')|?  what's the difference?

[dpapad, 2016/09/20 00:52:36]

No good reason. Changed to use fire().

     }.bind(this));
   },
 
   /**
    * Displays the settings that will be reported in a new tab.
    * @private
    */
   onShowReportedSettingsTap_: function() {
     this.browserProxy_.showReportedSettings();
   },
 });