chrome: Cleanup class/struct forward declarations

chrome/browser/chromeos/extensions/file_manager/event_router.h

 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_EVENT_ROUTER_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_EVENT_ROUTER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 19 matching lines @@
 #include "components/drive/chromeos/sync_client.h"
 #include "components/drive/service/drive_service_interface.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "storage/browser/fileapi/file_system_operation.h"
 
 class PrefChangeRegistrar;
 class Profile;
 
 using file_manager::util::EntryDefinition;
 
-namespace base {
-class ListValue;
-}
-
 namespace chromeos {
 class NetworkState;
 }
 
 namespace drive {
 class FileChange;
 }
 
 namespace file_manager {
 
@@ skipping 171 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<EventRouter> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EventRouter);
 };
 
 }  // namespace file_manager
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_EVENT_ROUTER_H_