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

remoting/host/remoting_me2me_host.cc

 // Copyright (c) 2012 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.
 //
 // This file implements a standalone host process for Me2Me.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 1435 matching lines @@
       protocol::CandidateSessionConfig::CreateDefault();
   if (!desktop_environment_factory_->SupportsAudioCapture())
     protocol_config->DisableAudioChannel();
   if (enable_vp9_)
     protocol_config->set_vp9_experiment_enabled(true);
   protocol_config->set_webrtc_supported(true);
   session_manager->set_protocol_config(std::move(protocol_config));
 
   host_.reset(new ChromotingHost(desktop_environment_factory_.get(),
                                  std::move(session_manager), transport_context,
-                                 context_->audio_task_runner(),
-                                 context_->video_encode_task_runner()));
+                                 *context_));
 
   if (gnubby_auth_policy_enabled_ && gnubby_extension_supported_) {
     host_->AddExtension(base::WrapUnique(new GnubbyExtension()));
   }
 
   // TODO(simonmorris): Get the maximum session duration from a policy.
 #if defined(OS_LINUX)
   host_->SetMaximumSessionDuration(base::TimeDelta::FromHours(20));
 #endif
 
@@ skipping 187 matching lines @@
       base::TimeDelta::FromSeconds(kShutdownTimeoutSeconds));
   new HostProcess(std::move(context), &exit_code, &shutdown_watchdog);
 
   // Run the main (also UI) message loop until the host no longer needs it.
   message_loop.Run();
 
   return exit_code;
 }
 
 }  // namespace remoting