Convert SearchTabHelper to use the new navigation callbacks.

chrome/test/data/extensions/api_test/tabs/on_updated/test.js

 // Copyright (c) 2011 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.
 
 var expectedEventData;
 var capturedEventData;
 var shouldIgnore;
 
 function expect(data, ignoreFunc) {
   expectedEventData = data;
@@ skipping 32 matching lines @@
       { status: 'loading', url: getURL('browserThenRendererInitiated/b.html') },
       { status: 'complete' },
     ]);
 
     chrome.tabs.create({ url: getURL('browserThenRendererInitiated/a.html') });
   },
 
   function newTab() {
     // Test for crbug.com/27208.
     expect([
+      { title : "New Tab" },
       { status: 'loading', url: 'chrome://newtab/' },
       { status: 'complete' }
-    ]);
+    ], function(info) {
+      // TODO(jam): remove this logic and the title line above when PlzNavigate
+      // is turned on by default. Right now the test has to handle both cases
+      // which have different timing. http://crbug.com/368813
+      if (info.status === 'loading' && capturedEventData.length == 0) {
+        expectedEventData.shift();
+      }
+      return false;
+    });
 
     chrome.tabs.create({ url: 'chrome://newtab/' });
   },
 
   /*
   // TODO(rafaelw) -- This is disabled because this test is flakey.
   function updateDuringCreateCallback() {
     // Test for crbug.com/27204.
     // We have to ignore anything that comes before the about:blank loading
     // status.
@@ skipping 59 matching lines @@
     expect([
       { status: 'loading', url: getURL('title/test.html') },
       { status: 'complete' },
       { title: 'foo' },
       { title: 'bar' }
     ]);
 
     chrome.tabs.create({ url: getURL('title/test.html') });
   }
 ]);