Fix wrong DCHECK for handler

chromeos/dbus/ibus/ibus_engine_factory_service.cc

Index: chromeos/dbus/ibus/ibus_engine_factory_service.cc
diff --git a/chromeos/dbus/ibus/ibus_engine_factory_service.cc b/chromeos/dbus/ibus/ibus_engine_factory_service.cc
index ed1b8e0f34f64b93bf445a3db70ca43f34ac26b8..9b4bfd472c630a6f4c853fd963a768e166752541 100644
--- a/chromeos/dbus/ibus/ibus_engine_factory_service.cc
+++ b/chromeos/dbus/ibus/ibus_engine_factory_service.cc
@@ -41,7 +41,7 @@ class IBusEngineFactoryServiceImpl : public IBusEngineFactoryService {
   virtual void SetCreateEngineHandler(
       const std::string& engine_id,
       const CreateEngineHandler& create_engine_handler) OVERRIDE {
-    DCHECK(!create_engine_callback_map_[engine_id].is_null());
+    DCHECK(create_engine_callback_map_[engine_id].is_null());
     create_engine_callback_map_[engine_id] = create_engine_handler;
   }