Convert now component to use GCM rather than pushMessaging.

chrome/browser/resources/google_now/background_test_util.js

Index: chrome/browser/resources/google_now/background_test_util.js
diff --git a/chrome/browser/resources/google_now/background_test_util.js b/chrome/browser/resources/google_now/background_test_util.js
index 52d77dafff3737b007e2ca0f6a264075cdc3b137..7f6e4aa0d2142253ca7b4cb1f995a6e7020c5e7f 100644
--- a/chrome/browser/resources/google_now/background_test_util.js
+++ b/chrome/browser/resources/google_now/background_test_util.js
@@ -18,12 +18,12 @@ var buildAttemptManager = emptyMock;
 var buildCardSet = emptyMock;
 
 var instrumented = {};
+mockChromeEvent(instrumented, 'gcm.onMessage');
 mockChromeEvent(instrumented, 'notifications.onButtonClicked');
 mockChromeEvent(instrumented, 'notifications.onClicked');
 mockChromeEvent(instrumented, 'notifications.onClosed');
 mockChromeEvent(instrumented, 'notifications.onPermissionLevelChanged');
 mockChromeEvent(instrumented, 'notifications.onShowSettings');
-mockChromeEvent(instrumented, 'pushMessaging.onMessage');
 mockChromeEvent(instrumented, 'runtime.onInstalled');
 mockChromeEvent(instrumented, 'runtime.onStartup');
 mockChromeEvent(instrumented, 'storage.onChanged');