InlinedVisitor: Migrate dom to use inlined tracing

Source/core/dom/custom/CustomElementRegistry.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 80 matching lines @@
     }
 
     return definition.get();
 }
 
 CustomElementDefinition* CustomElementRegistry::find(const CustomElementDescriptor& descriptor) const
 {
     return m_definitions.get(descriptor);
 }
 
-void CustomElementRegistry::trace(Visitor* visitor)
+DEFINE_TRACE(CustomElementRegistry)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_definitions);
 #endif
 }
 
 } // namespace blink