Convert //remoting to use std::unique_ptr

remoting/host/security_key/gnubby_extension.h

Index: remoting/host/security_key/gnubby_extension.h
diff --git a/remoting/host/security_key/gnubby_extension.h b/remoting/host/security_key/gnubby_extension.h
index 7cad0954c1c65584e806a080f0506bbeca0eb7d3..79c85f0b6c0857ad85eac2b54bbeaf989d9f0844 100644
--- a/remoting/host/security_key/gnubby_extension.h
+++ b/remoting/host/security_key/gnubby_extension.h
@@ -5,10 +5,10 @@
 #ifndef REMOTING_HOST_SECURITY_KEY_GNUBBY_EXTENSION_H_
 #define REMOTING_HOST_SECURITY_KEY_GNUBBY_EXTENSION_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "remoting/host/host_extension.h"
 
 namespace remoting {
@@ -21,7 +21,7 @@ class GnubbyExtension : public HostExtension {
 
   // HostExtension interface.
   std::string capability() const override;
-  scoped_ptr<HostExtensionSession> CreateExtensionSession(
+  std::unique_ptr<HostExtensionSession> CreateExtensionSession(
       ClientSessionControl* client_session_control,
       protocol::ClientStub* client_stub) override;