chrome: Cleanup class/struct forward declarations

chrome/browser/download/notification/download_notification.h

 // Copyright 2015 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_DOWNLOAD_NOTIFICATION_DOWNLOAD_NOTIFICATION_H_
 #define CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_NOTIFICATION_H_
 
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/download/download_commands.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_delegate.h"
 #include "chrome/browser/notifications/notification_test_util.h"
 #include "content/public/browser/download_item.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_observer.h"
 
-namespace test {
-class DownloadItemNotificationTest;
-}
-
-class DownloadNotificationManagerForProfile;
-
 class DownloadNotification {
  public:
   DownloadNotification();
   virtual ~DownloadNotification();
 
   static const char kDownloadNotificationOrigin[];
 
   virtual void OnDownloadUpdated(content::DownloadItem* item) = 0;
   virtual void OnDownloadRemoved(content::DownloadItem* item) = 0;
 
@@ skipping 11 matching lines @@
  protected:
   NotificationDelegate* watcher() const;
 
  private:
   scoped_refptr<NotificationDelegate> watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadNotification);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_NOTIFICATION_H_