MD Settings: Use dom-if for the profile disconnect dialog.

chrome/browser/resources/settings/people_page/people_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-people-page' is the settings page containing sign-in settings.
  */
 Polymer({
   is: 'settings-people-page',
@@ skipping 35 matching lines @@
      * True if the current profile manages supervised users.
      */
     profileManagesSupervisedUsers_: Boolean,
 
     /** @private {!settings.SyncBrowserProxy} */
     syncBrowserProxy_: {
       type: Object,
       value: function() {
         return settings.SyncBrowserProxyImpl.getInstance();
       },
+
+      /** @private */
+      showingDisconnectDialog_: Boolean,
     },
 
 <if expr="chromeos">
     /**
      * True if quick unlock settings should be displayed on this machine.
      * @private
      */
     quickUnlockEnabled_: {
       type: Boolean,
       value: function() {
@@ skipping 144 matching lines @@
     this.syncBrowserProxy_.openActivityControlsUrl();
   },
 
   /** @private */
   onSigninTap_: function() {
     this.syncBrowserProxy_.startSignIn();
   },
 
   /** @private */
   onDisconnectTap_: function() {
-    this.$.disconnectDialog.showModal();
+    this.showingDisconnectDialog_ = true;
+    this.async(function() {
+      this.$$('#disconnectDialog').showModal();
+    }.bind(this));
   },
 
   /** @private */
   onDisconnectCancel_: function() {
-    this.$.disconnectDialog.close();
+    this.$$('#disconnectDialog').close();
   },
 
   /** @private */
   onDisconnectConfirm_: function() {
     var deleteProfile = !!this.syncStatus.domain ||
-        (this.$.deleteProfile && this.$.deleteProfile.checked);
+        (this.$$('#deleteProfile') && this.$$('#deleteProfile').checked);
     this.syncBrowserProxy_.signOut(deleteProfile);
 
-    this.$.disconnectDialog.close();
+    this.$$('#disconnectDialog').close();
   },
 
   /** @private */
+  onDisconnectDialogClosed_: function() {
+    this.showingDisconnectDialog_ = false;
+  },
+
+  /** @private */
   onSyncTap_: function() {
     assert(this.syncStatus.signedIn);
     assert(this.syncStatus.syncSystemEnabled);
 
     if (this.syncStatus.managed)
       return;
 
     settings.navigateTo(settings.Route.SYNC);
   },
 
@@ skipping 77 matching lines @@
     if (!syncStatus)
       return '';
     if (syncStatus.hasError)
       return 'settings:sync-problem';
     if (syncStatus.managed)
       return 'settings:sync-disabled';
 
     return 'settings:done';
   },
 });