Use OnceCallback on Mojo interfaces in //chrome/common/media_router

chrome/utility/media_router/dial_device_description_parser_impl.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/utility/media_router/dial_device_description_parser_impl.h"
 
 #include <libxml/parser.h>
 #include <libxml/tree.h>
 #include <libxml/xpath.h>
 #include <utility>
@@ skipping 45 matching lines @@
 // static
 void DialDeviceDescriptionParserImpl::Create(
     const service_manager::BindSourceInfo& source_info,
     chrome::mojom::DialDeviceDescriptionParserRequest request) {
   mojo::MakeStrongBinding(base::MakeUnique<DialDeviceDescriptionParserImpl>(),
                           std::move(request));
 }
 
 void DialDeviceDescriptionParserImpl::ParseDialDeviceDescription(
     const std::string& device_description_xml_data,
-    const ParseDialDeviceDescriptionCallback& callback) {
+    ParseDialDeviceDescriptionCallback callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!callback.is_null());
 
   chrome::mojom::DialDeviceDescriptionPtr device_description =
       Parse(device_description_xml_data);
-  callback.Run(std::move(device_description));
+  std::move(callback).Run(std::move(device_description));
 }
 
 chrome::mojom::DialDeviceDescriptionPtr DialDeviceDescriptionParserImpl::Parse(
     const std::string& xml) {
   XmlReader xml_reader;
   if (!xml_reader.Load(xml))
     return nullptr;
 
   chrome::mojom::DialDeviceDescriptionPtr out =
       chrome::mojom::DialDeviceDescription::New();
@@ skipping 23 matching lines @@
   ErrorType error = Validate(*out);
   if (error != ErrorType::NONE) {
     DLOG(WARNING) << "Device description failed to validate: " << error;
     return nullptr;
   }
 
   return out;
 }
 
 }  // namespace media_router