[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/discovery/dial/safe_dial_device_description_parser.cc

 // Copyright 2017 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.
 
 #include "chrome/browser/media/router/discovery/dial/safe_dial_device_description_parser.h"
 
 #include <utility>
 
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 14 matching lines @@
 
   device_description_callback_ = callback;
 
   utility_process_mojo_client_ =
       base::MakeUnique<content::UtilityProcessMojoClient<
           chrome::mojom::DialDeviceDescriptionParser>>(
           l10n_util::GetStringUTF16(
               IDS_UTILITY_PROCESS_DIAL_DEVICE_DESCRIPTION_PARSER_NAME));
 
   utility_process_mojo_client_->set_error_callback(base::Bind(
-      &SafeDialDeviceDescriptionParser::OnParseDeviceDescriptionFailed,
-      base::Unretained(this)));
+      &SafeDialDeviceDescriptionParser::OnParseDeviceDescriptionFailed, this));
 
   // This starts utility process in the background.
   utility_process_mojo_client_->Start();
 
   // This call is queued up until the Mojo message pipe has been established to
   // the service running in the utility process.
   utility_process_mojo_client_->service()->ParseDialDeviceDescription(
       xml_text,
       base::Bind(
           &SafeDialDeviceDescriptionParser::OnParseDeviceDescriptionComplete,
-          base::Unretained(this)));
+          this));
 }
 
 void SafeDialDeviceDescriptionParser::OnParseDeviceDescriptionComplete(
     chrome::mojom::DialDeviceDescriptionPtr device_description) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   utility_process_mojo_client_.reset();  // Terminate the utility process.
 
   DCHECK(device_description_callback_);
   device_description_callback_.Run(std::move(device_description));
 }
 
 void SafeDialDeviceDescriptionParser::OnParseDeviceDescriptionFailed() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   utility_process_mojo_client_.reset();  // Terminate the utility process.
 
   DCHECK(device_description_callback_);
   device_description_callback_.Run(nullptr);
 }
 
 }  // namespace media_router