storage: Cleanup class/struct forward declarations

storage/browser/fileapi/quota/quota_reservation_manager.h

 // Copyright 2013 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 STORAGE_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_MANAGER_H_
 #define STORAGE_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 10 matching lines @@
 #include "url/gurl.h"
 
 namespace content {
 class QuotaReservationManagerTest;
 }
 
 namespace storage {
 
 class QuotaReservation;
 class QuotaReservationBuffer;
-class OpenFileHandle;
-class OpenFileHandleContext;
 
 class STORAGE_EXPORT QuotaReservationManager {
  public:
   // Callback for ReserveQuota. When this callback returns false, ReserveQuota
   // operation should be reverted.
   typedef base::Callback<bool(base::File::Error error, int64_t delta)>
       ReserveQuotaCallback;
 
   // An abstraction of backing quota system.
   class STORAGE_EXPORT QuotaBackend {
@@ skipping 76 matching lines @@
 
   base::SequenceChecker sequence_checker_;
   base::WeakPtrFactory<QuotaReservationManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuotaReservationManager);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_QUOTA_QUOTA_RESERVATION_MANAGER_H_