md-settings: Fix back navigation from /resetProfileSettings.

chrome/browser/resources/settings/reset_page/reset_page.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-page' is the settings page containing reset
  * settings.
  *
  * Example:
@@ skipping 13 matching lines @@
 <if expr="chromeos">
     /** @private */
     showPowerwashDialog_: Boolean,
 </if>
 
     /** @private */
     allowPowerwash_: {
       type: Boolean,
       value: cr.isChromeOS ? loadTimeData.getBoolean('allowPowerwash') : false
     },
+
+    /** @private */
+    showResetProfileDialog_: {
+      type: Boolean,
+      value: false,
+    },
   },
 
   /** @protected */
   currentRouteChanged: function() {
-    if (settings.getCurrentRoute() == settings.Route.RESET_DIALOG) {
-      this.$.resetProfileDialog.get().open();
-    }
+    this.showResetProfileDialog_ =
+        settings.getCurrentRoute() == settings.Route.RESET_DIALOG;
   },
 
   /** @private */
   onShowResetProfileDialog_: function() {
     settings.navigateTo(settings.Route.RESET_DIALOG);
   },
 
   /** @private */
   onResetProfileDialogClose_: function() {
     settings.navigateToPreviousRoute();
   },
 
 <if expr="chromeos">
   /** @private */
   onShowPowerwashDialog_: function() {
     this.showPowerwashDialog_ = true;
   },
 
   /** @private */
   onPowerwashDialogClose_: function() {
     this.showPowerwashDialog_ = false;
   },
 </if>
 });