Moving file_system_proxy to base/ and changing it to work with MessageLoopPro...

chrome/browser/file_system_proxy.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 CHROME_BROWSER_FILE_SYSTEM_PROXY_H_
-#define CHROME_BROWSER_FILE_SYSTEM_PROXY_H_
-
-#include "base/callback.h"
-#include "base/platform_file.h"
-#include "base/ref_counted.h"
-
-// This class provides asynchronous access to common file routines.
-class FileSystemProxy {
- public:
-  // This callback is used by methods that report success with a bool.  It is
-  // valid to pass NULL as the callback parameter to any function that takes a
-  // StatusCallback, in which case the operation will complete silently.
-  typedef Callback1<bool /* succeeded */>::Type StatusCallback;
-
-  // Creates or opens a file with the given flags.  It is invalid to pass NULL
-  // for the callback.
-  typedef Callback2<base::PassPlatformFile, bool /* created */>::Type
-      CreateOrOpenCallback;
-  static void CreateOrOpen(const FilePath& file_path,
-                           int file_flags,
-                           CreateOrOpenCallback* callback);
-
-  // Creates a temporary file for writing.  The path and an open file handle
-  // are returned.  It is invalid to pass NULL for the callback.
-  typedef Callback2<base::PassPlatformFile, FilePath>::Type
-      CreateTemporaryCallback;
-  static void CreateTemporary(CreateTemporaryCallback* callback);
-
-  // Close the given file handle.
-  static void Close(base::PlatformFile, StatusCallback* callback);
-
-  // Deletes a file or empty directory.
-  static void Delete(const FilePath& file_path,
-                     StatusCallback* callback);
-
-  // Deletes a directory and all of its contents.
-  static void RecursiveDelete(const FilePath& file_path,
-                              StatusCallback* callback);
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(FileSystemProxy);
-};
-
-#endif  // CHROME_BROWSER_FILE_SYSTEM_PROXY_H_