MD Settings: Disallow clicking on "Reset" when resetting profile is in progress.

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({
   is: 'settings-reset-profile-dialog',
 
   behaviors: [WebUIListenerBehavior],
 
+  properties: {
+    // TODO(dpapad): Evaluate whether this needs to be synced across different
+    // settings tabs.
+    /** @private */
+    clearingInProgress_: {
+      type: Boolean,
+      value: false,
+    },
+  },
+
   /** @private {!settings.ResetBrowserProxy} */
   browserProxy_: null,
 
   /** @override */
   ready: function() {
     this.browserProxy_ = settings.ResetBrowserProxyImpl.getInstance();
 
     this.addEventListener('iron-overlay-canceled', function() {
       this.browserProxy_.onHideResetProfileDialog();
     }.bind(this));
   },
 
   open: function() {
     this.$.dialog.open();
     this.browserProxy_.onShowResetProfileDialog();
   },
 
   /** @private */
   onCancelTap_: function() {
     this.$.dialog.cancel();
   },
 
   /** @private */
   onResetTap_: function() {
-    this.$.resetSpinner.active = true;
+    this.clearingInProgress_ = true;
     this.browserProxy_.performResetProfileSettings(
         this.$.sendSettings.checked).then(function() {
-      this.$.resetSpinner.active = false;
+      this.clearingInProgress_ = false;
       this.$.dialog.close();
       this.dispatchEvent(new CustomEvent('reset-done'));
     }.bind(this));
   },
 
   /**
    * Displays the settings that will be reported in a new tab.
    * @private
    */
   onShowReportedSettingsTap_: function() {
     this.browserProxy_.showReportedSettings();
   },
 });