Move browser-agnostic code from file_system_util to file_system_core_util.

chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.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/file_system_backend_delegate.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/drive/file_system_core_util.h"
 #include "chrome/browser/chromeos/drive/file_system_interface.h"
-#include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/drive/fileapi/async_file_util.h"
 #include "chrome/browser/chromeos/drive/fileapi/fileapi_worker.h"
 #include "chrome/browser/chromeos/drive/fileapi/webkit_file_stream_reader_impl.h"
 #include "chrome/browser/chromeos/drive/fileapi/webkit_file_stream_writer_impl.h"
 #include "chrome/browser/drive/drive_api_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "storage/browser/fileapi/async_file_util.h"
 #include "storage/browser/fileapi/file_stream_reader.h"
 #include "storage/browser/fileapi/file_system_context.h"
 #include "storage/browser/fileapi/file_system_url.h"
@@ skipping 116 matching lines @@
     const storage::FileSystemURL& url,
     const storage::URLCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&GetRedirectURLForContentsOnUIThread, url, callback));
 }
 
 }  // namespace drive