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

chrome/test/data/webui/settings/people_page_test.js

Index: chrome/test/data/webui/settings/people_page_test.js
diff --git a/chrome/test/data/webui/settings/people_page_test.js b/chrome/test/data/webui/settings/people_page_test.js
index 424e4be44ca773c3325fb05cf18446feab95f5f6..e2b14e58d2f5a45e52b44df9883a1c4dd5907b58 100644
--- a/chrome/test/data/webui/settings/people_page_test.js
+++ b/chrome/test/data/webui/settings/people_page_test.js
@@ -157,11 +157,11 @@ cr.define('settings_people_page', function() {
 
           MockInteractions.tap(disconnectButton);
           Polymer.dom.flush();
+        }).then(function() {
+          assertTrue(!!peoplePage.$$('#disconnectDialog').open);
+          assertFalse(peoplePage.$$('#deleteProfile').hidden);
 
-          assertTrue(peoplePage.$.disconnectDialog.open);
-          assertFalse(peoplePage.$.deleteProfile.hidden);
-
-          var disconnectConfirm = peoplePage.$.disconnectConfirm;
+          var disconnectConfirm = peoplePage.$$('#disconnectConfirm');
           assertTrue(!!disconnectConfirm);
           assertFalse(disconnectConfirm.hidden);
           MockInteractions.tap(disconnectConfirm);
@@ -178,15 +178,15 @@ cr.define('settings_people_page', function() {
           });
           Polymer.dom.flush();
 
-          assertFalse(peoplePage.$.disconnectDialog.open);
+          assertFalse(!!peoplePage.$$('#disconnectDialog'));
           MockInteractions.tap(disconnectButton);
           Polymer.dom.flush();
-
-          assertTrue(peoplePage.$.disconnectDialog.open);
-          assertTrue(peoplePage.$.deleteProfile.hidden);
+        }).then(function() {
+          assertTrue(peoplePage.$$('#disconnectDialog').open);
+          assertTrue(peoplePage.$$('#deleteProfile').hidden);
 
           var disconnectManagedProfileConfirm =
-              peoplePage.$.disconnectManagedProfileConfirm;
+              peoplePage.$$('#disconnectManagedProfileConfirm');
           assertTrue(!!disconnectManagedProfileConfirm);
           assertFalse(disconnectManagedProfileConfirm.hidden);