Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/notifications/desktop_notification_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "chrome/browser/content_settings/content_settings_provider.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/common/content_settings.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebNotificationPresenter.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextDirection.h"
 
 class ContentSettingsPattern;
-class Extension;
 class Notification;
-class NotificationDelegate;
 class NotificationUIManager;
-class PrefService;
 class Profile;
 class TabContents;
 
 namespace content {
 struct ShowDesktopNotificationHostMsgParams;
 }
 
 // The DesktopNotificationService is an object, owned by the Profile,
 // which provides the creation of desktop "toasts" to web pages and workers.
 class DesktopNotificationService : public content::NotificationObserver,
@@ skipping 107 matching lines @@
   // Non-owned pointer to the notification manager which manages the
   // UI for desktop toasts.
   NotificationUIManager* ui_manager_;
 
   content::NotificationRegistrar notification_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNotificationService);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_DESKTOP_NOTIFICATION_SERVICE_H_