Fix wrong DCHECK for handler

chromeos/dbus/ibus/ibus_engine_factory_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/dbus/ibus/ibus_engine_factory_service.h"
 
 #include <map>
 #include <string>
 
 #include "base/string_number_conversions.h"
@@ skipping 23 matching lines @@
 
   virtual ~IBusEngineFactoryServiceImpl() {
     bus_->UnregisterExportedObject(dbus::ObjectPath(
         ibus::engine_factory::kServicePath));
   }
 
   // IBusEngineFactoryService override.
   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;
   }
 
   // IBusEngineFactoryService override.
   virtual void UnsetCreateEngineHandler(
       const std::string& engine_id) OVERRIDE {
     create_engine_callback_map_[engine_id].Reset();
   }
 
  private:
@@ skipping 77 matching lines @@
 IBusEngineFactoryService* IBusEngineFactoryService::Create(
     dbus::Bus* bus,
     DBusClientImplementationType type) {
   if (type == REAL_DBUS_CLIENT_IMPLEMENTATION)
     return new IBusEngineFactoryServiceImpl(bus);
   else
     return new IBusEngineFactoryServiceStubImpl();
 }
 
 }  // namespace chromeos