Convert //chromecast from scoped_ptr to std::unique_ptr

chromecast/utility/cast_content_utility_client_simple.cc

 // Copyright 2016 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 "chromecast/utility/cast_content_utility_client.h"
 
 namespace chromecast {
 namespace shell {
 
 // static
-scoped_ptr<CastContentUtilityClient> CastContentUtilityClient::Create() {
-  return scoped_ptr<CastContentUtilityClient>();
+std::unique_ptr<CastContentUtilityClient> CastContentUtilityClient::Create() {
+  return std::unique_ptr<CastContentUtilityClient>();
 }
 
 }  // namespace shell
 }  // namespace chromecast