MD Settings: make chrome://[md-]settings/clearBrowserData URL work

chrome/browser/resources/settings/privacy_page/privacy_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-privacy-page' is the settings page containing privacy and
  * security settings.
  */
 Polymer({
   is: 'settings-privacy-page',
 
   properties: {
     /**
      * Preferences state.
      */
     prefs: {
       type: Object,
       notify: true,
     },
 
     /**
      * The current active route.
      */
     currentRoute: {
+      observer: 'currentRouteChanged_',
       type: Object,
       notify: true,
     },
 
     /** @private */
     showClearBrowsingDataDialog_: Boolean,
   },
 
   ready: function() {
     this.ContentSettingsTypes = settings.ContentSettingsTypes;
   },
 
+  /**
+   * @param {!SettingsRoute} newRoute
+   * @param {!SettingsRoute} oldRoute
+   * @private
+   */
+  currentRouteChanged_: function(newRoute, oldRoute) {
+    if (newRoute.subpage == 'clear-browsing-data')

[michaelpg, 2016/06/27 19:33:49]

add a TODO to not do this

+      this.showClearBrowsingDataDialog_ = true;
+    else if (oldRoute && oldRoute.subpage == 'clear-browsing-data')
+      this.showClearBrowsingDataDialog_ = false;
+  },
+
   /** @private */
   onManageCertificatesTap_: function() {
 <if expr="use_nss_certs">
     this.$.pages.setSubpageChain(['manage-certificates']);
 </if>
 <if expr="is_win or is_macosx">
     settings.PrivacyPageBrowserProxyImpl.getInstance().
       showManageSSLCertificates();
 </if>
   },
 
   /** @private */
   onSiteSettingsTap_: function() {
     this.$.pages.setSubpageChain(['site-settings']);
   },
 
   /** @private */
   onClearBrowsingDataTap_: function() {
-    this.showClearBrowsingDataDialog_ = true;
+    this.currentRoute = {
+      url: '/clearBrowserData',
+      page: 'advanced',
+      section: 'privacy',
+      subpage: ['clear-browsing-data'],
+    };
   },
 
   /**
    * @param {!Event} event
    * @private
    */
   onIronOverlayClosed_: function(event) {
     if (Polymer.dom(event).rootTarget.tagName == 'CR-DIALOG')
       this.showClearBrowsingDataDialog_ = false;
   },
 });