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

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

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_SAFE_DIAL_DEVICE_DESCRIPTION_PARSER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_SAFE_DIAL_DEVICE_DESCRIPTION_PARSER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 18 matching lines @@
   using DeviceDescriptionCallback = chrome::mojom::DialDeviceDescriptionParser::
       ParseDialDeviceDescriptionCallback;
 
   SafeDialDeviceDescriptionParser();
   virtual ~SafeDialDeviceDescriptionParser();
 
   // Start parsing device description XML file in utility process.
   // TODO(crbug.com/702766): Add an enum type describing why utility process
   // fails to parse device description xml.
   virtual void Start(const std::string& xml_text,
-                     const DeviceDescriptionCallback& callback);
+                     DeviceDescriptionCallback callback);
 
  private:
   // Utility client used to send device description parsing task to the utility
   // process.
   std::unique_ptr<content::UtilityProcessMojoClient<
       chrome::mojom::DialDeviceDescriptionParser>>
       utility_process_mojo_client_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(SafeDialDeviceDescriptionParser);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_SAFE_DIAL_DEVICE_DESCRIPTION_PARSER_H_