Convert //remoting to use std::unique_ptr

remoting/host/security_key/gnubby_auth_handler.h

Index: remoting/host/security_key/gnubby_auth_handler.h
diff --git a/remoting/host/security_key/gnubby_auth_handler.h b/remoting/host/security_key/gnubby_auth_handler.h
index fe6dff0def7d06b752f29126be2899d29950bdc3..0a6a7551300d7787ca47752bda4b7a1cf9a57d09 100644
--- a/remoting/host/security_key/gnubby_auth_handler.h
+++ b/remoting/host/security_key/gnubby_auth_handler.h
@@ -5,10 +5,10 @@
 #ifndef REMOTING_HOST_SECURITY_KEY_GNUBBY_AUTH_HANDLER_H_
 #define REMOTING_HOST_SECURITY_KEY_GNUBBY_AUTH_HANDLER_H_
 
+#include <memory>
 #include <string>
 
 #include "base/callback.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 namespace base {
@@ -31,7 +31,7 @@ class GnubbyAuthHandler {
   // All invocations of |callback| are guaranteed to occur before the underlying
   // GnubbyAuthHandler object is destroyed.  It is not safe to destroy the
   // GnubbyAuthHandler object within the callback.
-  static scoped_ptr<GnubbyAuthHandler> Create(
+  static std::unique_ptr<GnubbyAuthHandler> Create(
       const SendMessageCallback& callback);
 
 #if defined(OS_LINUX)