Fix IWYU violators that don't include scoped_ptr.h in CrOS build.

chrome/browser/chromeos/drive/fileapi/async_file_util.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_CHROMEOS_DRIVE_FILEAPI_ASYNC_FILE_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILEAPI_ASYNC_FILE_UTIL_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "storage/browser/fileapi/async_file_util.h"
 
 namespace drive {
 
 class FileSystemInterface;
 
 namespace internal {
 
 // The implementation of storage::AsyncFileUtil for Drive File System.
 class AsyncFileUtil : public storage::AsyncFileUtil {
@@ skipping 62 matching lines @@
       const CreateSnapshotFileCallback& callback) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AsyncFileUtil);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILEAPI_ASYNC_FILE_UTIL_H_