Introduce FileSystemFileUtil and -Proxy to decorate base::file_util in webkit/fileapi.

webkit/fileapi/file_system_context.h

 // Copyright (c) 2010 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_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "webkit/quota/special_storage_policy.h"
 
 class FilePath;
 class GURL;
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace fileapi {
 
+class FileSystemContext;
 class FileSystemPathManager;
 class FileSystemQuotaManager;
 class FileSystemUsageTracker;
-class FileSystemContext;
 
 struct DefaultContextDeleter;
 
 // This class keeps and provides a file system context for FileSystem API.
 class FileSystemContext
     : public base::RefCountedThreadSafe<FileSystemContext,
                                         DefaultContextDeleter> {
  public:
   FileSystemContext(
       scoped_refptr<base::MessageLoopProxy> file_message_loop,
@@ skipping 26 matching lines @@
 
 struct DefaultContextDeleter {
   static void Destruct(const FileSystemContext* context) {
     context->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_