Settings People: Add /signOut route for 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 f00d12a50f9bd6e8b185cac04dbc476247ca0d92..9da3b8f7cefd453febae413579b5861e1290fbdc 100644
--- a/chrome/test/data/webui/settings/people_page_test.js
+++ b/chrome/test/data/webui/settings/people_page_test.js
@@ -166,10 +166,14 @@ cr.define('settings_people_page', function() {
           assertFalse(disconnectConfirm.hidden);
           MockInteractions.tap(disconnectConfirm);
 
-          return browserProxy.whenCalled('signOut');
+          // Wait for exit of dialog route.
+          return new Promise(function(resolve) {
+            window.addEventListener('popstate', function callback() {
+              window.removeEventListener('popstate', callback);
+              resolve(browserProxy.whenCalled('signOut'));
+            });
+          });
         }).then(function(deleteProfile) {
-          Polymer.dom.flush();
-
           assertFalse(deleteProfile);
 
           cr.webUIListenerCallback('sync-status-changed', {