Finishing API error processing, and cleanup

chrome/browser/resources/google_now/background_test_util.js

 // Copyright 2013 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.
 
 // Mocks for globals needed for loading background.js.
 
 var wrapper = {instrumentChromeApiFunction: emptyMock};
 
-function buildTaskManager() {
-  return {debugSetStepName: emptyMock};
-}
-
 function buildAuthenticationManager() {
   return {
     addListener: emptyMock
   };
 }
 
 var instrumentApiFunction = emptyMock;
+var buildTaskManager = emptyMock;
 var buildAttemptManager = emptyMock;
 var buildCardSet = emptyMock;
 
 var instrumented = {};
 mockChromeEvent(instrumented, 'location.onLocationUpdate');
 mockChromeEvent(instrumented, 'notifications.onButtonClicked');
 mockChromeEvent(instrumented, 'notifications.onClicked');
 mockChromeEvent(instrumented, 'notifications.onClosed');
 mockChromeEvent(instrumented, 'omnibox.onInputEntered');
 mockChromeEvent(
     instrumented, 'preferencesPrivate.googleGeolocationAccessEnabled.onChange');
 mockChromeEvent(instrumented, 'runtime.onInstalled');
 mockChromeEvent(instrumented, 'runtime.onStartup');