Fix a bunch of IWYU violators that don't include scoped_ptr.h

chrome/browser/sync_file_system/drive_backend/callback_helper.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_CALLBACK_HELPER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CALLBACK_HELPER_H_
 
 #include <type_traits>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 
 // TODO(tzik): Merge this file to media/base/bind_to_current_loop.h.
 
 namespace sync_file_system {
 namespace drive_backend {
 
 namespace internal {
 
@@ skipping 72 matching lines @@
     const base::Callback<T>& callback) {
   return RelayCallbackToTaskRunner(
       base::ThreadTaskRunnerHandle::Get(),
       from_here, callback);
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CALLBACK_HELPER_H_