Convert //dbus from scoped_ptr to std::unique_ptr

dbus/object_manager.cc

Index: dbus/object_manager.cc
diff --git a/dbus/object_manager.cc b/dbus/object_manager.cc
index 9215d84ecf0fa04b72b16423f33ec6ba3d6cdd41..56143c758b4bb9b40f72e0f55075e0caa1f77ddc 100644
--- a/dbus/object_manager.cc
+++ b/dbus/object_manager.cc
@@ -263,8 +263,7 @@ DBusHandlerResult ObjectManager::HandleMessage(DBusConnection* connection,
   // raw_message will be unrefed on exit of the function. Increment the
   // reference so we can use it in Signal.
   dbus_message_ref(raw_message);
-  scoped_ptr<Signal> signal(
-      Signal::FromRawMessage(raw_message));
+  std::unique_ptr<Signal> signal(Signal::FromRawMessage(raw_message));
 
   const std::string interface = signal->GetInterface();
   const std::string member = signal->GetMember();