chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/drive/download_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_DRIVE_DOWNLOAD_HANDLER_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DOWNLOAD_HANDLER_H_
 
 #include <stdint.h>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/download/all_download_item_notifier.h"
 #include "components/drive/file_errors.h"
 #include "content/public/browser/download_manager_delegate.h"
 
 class Profile;
 
 namespace content {
 class DownloadItem;
 class DownloadManager;
 }
 
 namespace drive {
 
 class FileSystemInterface;
-class ResourceEntry;
 
 // Observes downloads to temporary local drive folder. Schedules these
 // downloads for upload to drive service.
 class DownloadHandler : public AllDownloadItemNotifier::Observer {
  public:
   explicit DownloadHandler(FileSystemInterface* file_system);
   ~DownloadHandler() override;
 
   // Utility method to get DownloadHandler with profile.
   static DownloadHandler* GetForProfile(Profile* profile);
@@ skipping 100 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DownloadHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadHandler);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DOWNLOAD_HANDLER_H_