Extract external file systems handling from isolated context.

webkit/chromeos/fileapi/remote_file_system_operation.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 WEBKIT_CHROMEOS_FILEAPI_REMOTE_FILE_SYSTEM_OPERATION_H_
 #define WEBKIT_CHROMEOS_FILEAPI_REMOTE_FILE_SYSTEM_OPERATION_H_
 
-#include "webkit/chromeos/fileapi/remote_file_system_proxy.h"
 #include "webkit/fileapi/file_system_operation.h"
 #include "webkit/fileapi/file_writer_delegate.h"
+#include "webkit/fileapi/remote_file_system_proxy.h"
 
 namespace base {
 class Value;
 }
 
 namespace fileapi {
 class FileWriterDelegate;
 class LocalFileSystemOperation;
 }
 
@@ skipping 106 matching lines @@
 
   WriteCallback write_callback_;
   StatusCallback cancel_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteFileSystemOperation);
 };
 
 }  // namespace chromeos
 
 #endif  // WEBKIT_CHROMEOS_FILEAPI_REMOTE_FILE_SYSTEM_OPERATION_H_