components: Cleanup class/struct fwd declarations

components/drive/chromeos/directory_loader.h

 // Copyright 2014 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_DIRECTORY_LOADER_H_
 #define COMPONENTS_DRIVE_CHROMEOS_DIRECTORY_LOADER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 22 matching lines @@
 
 namespace drive {
 
 class EventLogger;
 class JobScheduler;
 class ResourceEntry;
 
 namespace internal {
 
 class AboutResourceLoader;
-class ChangeList;
 class ChangeListLoaderObserver;
 class DirectoryFetchInfo;
 class LoaderController;
 class ResourceMetadata;
 
 // DirectoryLoader is used to load directory contents.
 class DirectoryLoader {
  public:
   DirectoryLoader(EventLogger* logger,
                   base::SequencedTaskRunner* blocking_task_runner,
@@ skipping 90 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<DirectoryLoader> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(DirectoryLoader);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // COMPONENTS_DRIVE_CHROMEOS_DIRECTORY_LOADER_H_