Convert //chromecast from scoped_ptr to std::unique_ptr

chromecast/net/connectivity_checker_impl.h

Index: chromecast/net/connectivity_checker_impl.h
diff --git a/chromecast/net/connectivity_checker_impl.h b/chromecast/net/connectivity_checker_impl.h
index 0b40b5150f9dd2e004cdbe8dbb8d14063b099698..f600cb7bcfb3b5bc3d8f8f7d548a379da8cd489e 100644
--- a/chromecast/net/connectivity_checker_impl.h
+++ b/chromecast/net/connectivity_checker_impl.h
@@ -71,9 +71,9 @@ class ConnectivityCheckerImpl
   // Called when URL request timed out.
   void OnUrlRequestTimeout();
 
-  scoped_ptr<GURL> connectivity_check_url_;
-  scoped_ptr<net::URLRequestContext> url_request_context_;
-  scoped_ptr<net::URLRequest> url_request_;
+  std::unique_ptr<GURL> connectivity_check_url_;
+  std::unique_ptr<net::URLRequestContext> url_request_context_;
+  std::unique_ptr<net::URLRequest> url_request_;
   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   bool connected_;
   net::NetworkChangeNotifier::ConnectionType connection_type_;