[Mac] Move ScopedSendingEvent from content/common/mac to base/mac.

content/test/mock_chrome_application_mac.h

-// Copyright (c) 2011 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 CONTENT_TEST_MOCK_CHROME_APPLICATION_MAC_H_
-#define CONTENT_TEST_MOCK_CHROME_APPLICATION_MAC_H_
-#pragma once
-
-#if defined(__OBJC__)
-
-#import <AppKit/AppKit.h>
-
-#include "content/common/mac/scoped_sending_event.h"
-
-// Mock implementation supporting CrAppControlProtocol.  Can be used
-// in tests using ScopedSendingEvent to deal with nested message
-// loops.  Also implements CrAppProtocol so can be used as a
-// replacement for MockCrApp (in base/).
-@interface MockCrControlApp : NSApplication<CrAppControlProtocol> {
- @private
-  BOOL isHandlingSendEvent_;
-}
-@end
-
-#endif  // __OBJC__
-
-// To be used to instantiate MockCrControlApp from C++ code.
-namespace mock_cr_app {
-void RegisterMockCrControlApp();
-}  // namespace mock_cr_app
-
-#endif  // CONTENT_TEST_MOCK_CHROME_APPLICATION_MAC_H_