[Chromoting] Remove screen saver logic out of ScreenCapturer implementations

webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.cc

 /*
  *  Copyright (c) 2014 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 60 matching lines @@
     std::unique_ptr<SharedMemoryFactory> shared_memory_factory) {
   shared_memory_factory_ = std::move(shared_memory_factory);
 }
 
 void ScreenCapturerWinGdi::Capture(const DesktopRegion& region) {
   int64_t capture_start_time_nanos = rtc::TimeNanos();
 
   queue_.MoveToNextFrame();
   RTC_DCHECK(!queue_.current_frame() || !queue_.current_frame()->IsShared());
 
-  // Request that the system not power-down the system, or the display hardware.
-  if (!SetThreadExecutionState(ES_DISPLAY_REQUIRED | ES_SYSTEM_REQUIRED)) {
-    if (!set_thread_execution_state_failed_) {
-      set_thread_execution_state_failed_ = true;
-      LOG_F(LS_WARNING) << "Failed to make system & display power assertion: "
-                        << GetLastError();
-    }
-  }
-
   // Make sure the GDI capture resources are up-to-date.
   PrepareCaptureResources();
 
   if (!CaptureImage()) {
     callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
     return;
   }
 
   const DesktopFrame* current_frame = queue_.current_frame();
   const DesktopFrame* last_frame = queue_.previous_frame();
@@ skipping 159 matching lines @@
            SRCCOPY | CAPTUREBLT);
 
     // Select back the previously selected object to that the device contect
     // could be destroyed independently of the bitmap if needed.
     SelectObject(memory_dc_, previous_object);
   }
   return true;
 }
 
 }  // namespace webrtc