Clean up potentially leaky use of base::DeletePointer.

dbus/object_manager.h

Index: dbus/object_manager.h
diff --git a/dbus/object_manager.h b/dbus/object_manager.h
index 23a88cdc893ed871845a16f5c89b73f7d1302c28..50e3d966c5cb3fc8dcc4a6abb116bfd8fdb9d6f3 100644
--- a/dbus/object_manager.h
+++ b/dbus/object_manager.h
@@ -261,7 +261,7 @@ public:
   // This method notifies the relevant PropertySet that it should update its
   // properties based on the received signal. Called from HandleMessage.
   void NotifyPropertiesChanged(const dbus::ObjectPath object_path,
-                               Signal* signal);
+                               scoped_ptr<Signal> signal);
   void NotifyPropertiesChangedHelper(const dbus::ObjectPath object_path,
                                      Signal* signal);