storage: Cleanup class/struct forward declarations

storage/browser/fileapi/copy_or_move_operation_delegate.h

 // Copyright (c) 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_COPY_OR_MOVE_OPERATION_DELEGATE_H_
 #define STORAGE_BROWSER_FILEAPI_COPY_OR_MOVE_OPERATION_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <stack>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "storage/browser/fileapi/recursive_operation_delegate.h"
 
 namespace net {
 class DrainableIOBuffer;
 class IOBufferWithSize;
 }
 
 namespace storage {
 class FileStreamReader;
-class ShareableFileReference;
 enum class FlushPolicy;
 }
 
 namespace storage {
 
-class CopyOrMoveFileValidator;
 class FileStreamWriter;
 
 // A delegate class for recursive copy or move operations.
 class CopyOrMoveOperationDelegate
     : public RecursiveOperationDelegate {
  public:
   class CopyOrMoveImpl;
   typedef FileSystemOperation::CopyProgressCallback CopyProgressCallback;
   typedef FileSystemOperation::CopyOrMoveOption CopyOrMoveOption;
   typedef FileSystemOperation::ErrorBehavior ErrorBehavior;
@@ skipping 115 matching lines @@
 
   std::map<CopyOrMoveImpl*, std::unique_ptr<CopyOrMoveImpl>> running_copy_set_;
   base::WeakPtrFactory<CopyOrMoveOperationDelegate> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CopyOrMoveOperationDelegate);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_COPY_OR_MOVE_OPERATION_DELEGATE_H_