Revert 132312 - Proper fix for https://chromiumcodereview.appspot.com/10073005 :

chrome/browser/chromeos/gdata/mock_directory_change_observer.h

Index: chrome/browser/chromeos/gdata/mock_directory_change_observer.h
===================================================================
--- chrome/browser/chromeos/gdata/mock_directory_change_observer.h	(revision 132314)
+++ chrome/browser/chromeos/gdata/mock_directory_change_observer.h	(working copy)
@@ -1,26 +0,0 @@
-// Copyright (c) 2012 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_CHROMEOS_GDATA_MOCK_DIRECTORY_CHANGE_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_GDATA_MOCK_DIRECTORY_CHANGE_OBSERVER_H_
-#pragma once
-
-#include "chrome/browser/chromeos/gdata/gdata_file_system.h"
-#include "testing/gmock/include/gmock/gmock.h"
-
-namespace gdata {
-
-// Mock for GDataFileSystemInterface::Observer::OnDirectoryChanged().
-class MockDirectoryChangeObserver : public GDataFileSystemInterface::Observer {
- public:
-  MockDirectoryChangeObserver() {}
-  virtual ~MockDirectoryChangeObserver() {}
-
-  // GDataFileSystemInterface::Observer overrides.
-  MOCK_METHOD1(OnDirectoryChanged, void(const FilePath& directory_path));
-};
-
-}  // namespace gdata
-
-#endif  // CHROME_BROWSER_CHROMEOS_GDATA_MOCK_DIRECTORY_CHANGE_OBSERVER_H_