[Chromoting] Remove screen saver logic out of ScreenCapturer implementations

webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 77 matching lines @@
       IDXGIResource* resource);
 
   // A shortcut to execute callback with current frame in frames.
   void EmitCurrentFrame();
 
   ScreenCaptureFrameQueue<rtc::scoped_refptr<Texture>> surfaces_;
   ScreenCaptureFrameQueue<SharedDesktopFrame> frames_;
   std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
   Callback* callback_ = nullptr;
 
-  bool set_thread_execution_state_failed_ = false;
-
   RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerWinDirectx);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_SCREEN_CAPTURER_WIN_DIRECTX_H_