Unify HasGDocFileExtension and IsHostedDocumentByExtentoin.

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_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 "webkit/browser/blob/file_stream_reader.h"
 #include "webkit/browser/fileapi/async_file_util.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/browser/fileapi/file_system_url.h"
 
 using content::BrowserThread;
 
 namespace drive {
 
@@ skipping 34 matching lines @@
 scoped_ptr<fileapi::FileStreamWriter>
 FileSystemBackendDelegate::CreateFileStreamWriter(
     const fileapi::FileSystemURL& url,
     int64 offset,
     fileapi::FileSystemContext* context) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK_EQ(fileapi::kFileSystemTypeDrive, url.type());
 
   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
   // Hosted documents don't support stream writer.
-  if (file_path.empty() || util::HasGDocFileExtension(file_path))
+  if (file_path.empty() || util::HasHostedDocumentExtension(file_path))
     return scoped_ptr<fileapi::FileStreamWriter>();
 
   return scoped_ptr<fileapi::FileStreamWriter>(
       new internal::WebkitFileStreamWriterImpl(
           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
           context->default_file_task_runner(),file_path, offset));
 }
 
 }  // namespace drive