Add abstractions that let embedders drive tests of WebContents.

chrome/browser/notifications/desktop_notification_service.h

Index: chrome/browser/notifications/desktop_notification_service.h
diff --git a/chrome/browser/notifications/desktop_notification_service.h b/chrome/browser/notifications/desktop_notification_service.h
index e41b1928800a303f66fde5170ec7c06741dbc5f8..b56d1188ec538abebfd8d02ec0b79961dac86602 100644
--- a/chrome/browser/notifications/desktop_notification_service.h
+++ b/chrome/browser/notifications/desktop_notification_service.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -26,7 +26,6 @@ class ContentSettingsPattern;
 class Notification;
 class NotificationUIManager;
 class Profile;
-class TabContents;
 
 namespace content {
 class WebContents;