[SyncFS] Remove unneeded #include from sync_task_manager.h

chrome/browser/sync_file_system/drive_backend/sync_task_manager.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 CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_MANAGER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_MANAGER_H_
 
 #include <queue>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
-#include "base/files/file_path.h"
-#include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequence_checker.h"
 #include "base/threading/non_thread_safe.h"
-#include "chrome/browser/sync_file_system/drive_backend/sync_task.h"
 #include "chrome/browser/sync_file_system/drive_backend/task_dependency_manager.h"
 #include "chrome/browser/sync_file_system/sync_callbacks.h"
 #include "chrome/browser/sync_file_system/sync_status_code.h"
 #include "chrome/browser/sync_file_system/task_logger.h"
 
 namespace tracked_objects {
 class Location;
 }
 
 namespace sync_file_system {
 namespace drive_backend {
 
+class SyncTask;
 class SyncTaskToken;
 struct BlockingFactor;
 
 // This class manages asynchronous tasks for Sync FileSystem.  Each task must be
 // either a Task or a SyncTask.
 // The instance runs single task as the foreground task, and multiple tasks as
 // background tasks.  Running background task has a BlockingFactor that
 // describes which task can run in parallel.  When a task start running as a
 // background task, SyncTaskManager checks if any running background task
 // doesn't block the new background task, and queues it up if it can't run.
@@ skipping 152 matching lines @@
 
   base::SequenceChecker sequence_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncTaskManager);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_TASK_MANAGER_H_