components: Cleanup class/struct fwd declarations

components/drive/chromeos/file_system/create_directory_operation.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 COMPONENTS_DRIVE_CHROMEOS_FILE_SYSTEM_CREATE_DIRECTORY_OPERATION_H_
 #define COMPONENTS_DRIVE_CHROMEOS_FILE_SYSTEM_CREATE_DIRECTORY_OPERATION_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "components/drive/file_errors.h"
 
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 }  // namespace base
 
 namespace drive {
 
 class FileChange;
-class ResourceEntry;
 
 namespace internal {
 class ResourceMetadata;
 }  // namespace internal
 
 namespace file_system {
 
 class OperationDelegate;
 
 // This class encapsulates the drive Create Directory function.  It is
@@ skipping 35 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<CreateDirectoryOperation> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(CreateDirectoryOperation);
 };
 
 }  // namespace file_system
 }  // namespace drive
 
 #endif  // COMPONENTS_DRIVE_CHROMEOS_FILE_SYSTEM_CREATE_DIRECTORY_OPERATION_H_