components: Cleanup class/struct fwd declarations

components/drive/chromeos/sync/entry_update_performer.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 COMPONENTS_DRIVE_CHROMEOS_SYNC_ENTRY_UPDATE_PERFORMER_H_
 #define COMPONENTS_DRIVE_CHROMEOS_SYNC_ENTRY_UPDATE_PERFORMER_H_
 
 #include <memory>
 
 #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"
 #include "google_apis/drive/drive_api_error_codes.h"
 
 namespace base {
 class ScopedClosureRunner;
 class SequencedTaskRunner;
 }  // namespace base
 
 namespace google_apis {
 class FileResource;
 }  // namespace google_apis
 
 namespace drive {
 
 class FileChange;
 class JobScheduler;
-class ResourceEntry;
 struct ClientContext;
 
 namespace file_system {
 class OperationDelegate;
 }  // namespace file_system
 
 namespace internal {
 
 class EntryRevertPerformer;
 class FileCache;
@@ skipping 57 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<EntryUpdatePerformer> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(EntryUpdatePerformer);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // COMPONENTS_DRIVE_CHROMEOS_SYNC_ENTRY_UPDATE_PERFORMER_H_