[Chromoting] Use device::PowerSaveBlocker to block screen saver

remoting/remoting_host_srcs.gypi

 # 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.
 
 {
   'variables': {
     'remoting_host_sources': [
       'host/audio_capturer.cc',
       'host/audio_capturer.h',
       'host/audio_capturer_android.cc',
@@ skipping 104 matching lines @@
       'host/host_event_logger.h',
       'host/host_event_logger_posix.cc',
       'host/host_event_logger_win.cc',
       'host/host_exit_codes.cc',
       'host/host_exit_codes.h',
       'host/host_export.h',
       'host/host_extension.h',
       'host/host_extension_session.h',
       'host/host_extension_session_manager.cc',
       'host/host_extension_session_manager.h',
+      'host/host_power_save_blocker.h',
+      'host/host_power_save_blocker.cc',
       'host/host_secret.cc',
       'host/host_secret.h',
       'host/host_status_logger.cc',
       'host/host_status_logger.h',
       'host/host_status_monitor.h',
       'host/host_status_observer.h',
       'host/host_window.h',
       'host/host_window_proxy.cc',
       'host/host_window_proxy.h',
       'host/input_injector.h',
@@ skipping 212 matching lines @@
       'host/it2me/it2me_confirmation_dialog_chromeos.cc',
       'host/it2me/it2me_confirmation_dialog_proxy.cc',
       'host/it2me/it2me_confirmation_dialog_proxy.h',
       'host/it2me/it2me_host.cc',
       'host/it2me/it2me_host.h',
       'host/it2me/it2me_native_messaging_host.cc',
       'host/it2me/it2me_native_messaging_host.h',
     ],
   }
 }