Move scoped_nsdisable_screen_update from base to app/mac...

base/scoped_nsdisable_screen_updates.h

-// Copyright (c) 2009 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 BASE_SCOPED_NSDISABLE_SCREEN_UPDATES_H_
-#define BASE_SCOPED_NSDISABLE_SCREEN_UPDATES_H_
-#pragma once
-
-#import <Cocoa/Cocoa.h>
-
-#include "base/basictypes.h"
-
-namespace base {
-
-// A stack-based class to disable Cocoa screen updates. When instantiated, it
-// disables screen updates and enables them when destroyed. Update disabling
-// can be nested, and there is a time-maximum (about 1 second) after which
-// Cocoa will automatically re-enable updating. This class doesn't attempt to
-// overrule that.
-
-class ScopedNSDisableScreenUpdates {
- public:
-  ScopedNSDisableScreenUpdates() {
-    NSDisableScreenUpdates();
-  }
-  ~ScopedNSDisableScreenUpdates() {
-    NSEnableScreenUpdates();
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ScopedNSDisableScreenUpdates);
-};
-
-}  // namespace
-
-#endif  // BASE_SCOPED_NSDISABLE_SCREEN_UPDATES_H_