Move browser-agnostic code from file_system_util to file_system_core_util.

chrome/browser/chromeos/drive/fileapi/webkit_file_stream_writer_impl.cc

 // 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.
 
 #include "chrome/browser/chromeos/drive/fileapi/webkit_file_stream_writer_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
-#include "chrome/browser/chromeos/drive/file_system_util.h"
+#include "chrome/browser/chromeos/drive/file_system_core_util.h"
 #include "chrome/browser/chromeos/drive/fileapi/fileapi_worker.h"
 #include "content/public/browser/browser_thread.h"
 #include "google_apis/drive/task_util.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "storage/browser/fileapi/file_stream_writer.h"
 
 using content::BrowserThread;
 
 namespace drive {
@@ skipping 153 matching lines @@
       local_path,
       offset_,
       storage::FileStreamWriter::OPEN_EXISTING_FILE));
   int result = local_file_writer_->Write(buf, buf_len, callback);
   if (result != net::ERR_IO_PENDING)
     callback.Run(result);
 }
 
 }  // namespace internal
 }  // namespace drive