Remove OS_CHROMEOS from ui/ash code

chrome/browser/ui/ash/chrome_screenshot_grabber.h

 // Copyright 2014 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_UI_ASH_CHROME_SCREENSHOT_GRABBER_H_
 #define CHROME_BROWSER_UI_ASH_CHROME_SCREENSHOT_GRABBER_H_
 
 #include "ash/screenshot_delegate.h"
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 32 matching lines @@
       scoped_refptr<base::TaskRunner> blocking_task_runner,
       const FileCallback& callback_on_blocking_pool) override;
 
   // ui::ScreenshotGrabberObserver:
   void OnScreenshotCompleted(ui::ScreenshotGrabberObserver::Result result,
                              const base::FilePath& screenshot_path) override;
 
  private:
   friend class ash::test::ChromeScreenshotGrabberTest;
 
-#if defined(OS_CHROMEOS)
   Notification* CreateNotification(
       ui::ScreenshotGrabberObserver::Result screenshot_result,
       const base::FilePath& screenshot_path);
-#endif
 
   void SetProfileForTest(Profile* profile);
   Profile* GetProfile();
 
   std::unique_ptr<ui::ScreenshotGrabber> screenshot_grabber_;
   Profile* profile_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeScreenshotGrabber);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_CHROME_SCREENSHOT_GRABBER_H_