InlinedVisitor: Migrate dom to use inlined tracing

Source/core/dom/custom/CustomElementCallbackInvocation.h

 /*
  * Copyright (C) 2013 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 36 matching lines @@
     static PassOwnPtrWillBeRawPtr<CustomElementCallbackInvocation> createAttributeChangedInvocation(PassRefPtrWillBeRawPtr<CustomElementLifecycleCallbacks>, const AtomicString& name, const AtomicString& oldValue, const AtomicString& newValue);
 
 protected:
     CustomElementCallbackInvocation(PassRefPtrWillBeRawPtr<CustomElementLifecycleCallbacks> callbacks)
         : m_callbacks(callbacks)
     {
     }
 
     CustomElementLifecycleCallbacks* callbacks() { return m_callbacks.get(); }
 
-    virtual void trace(Visitor*) override;
+    DECLARE_VIRTUAL_TRACE();
 
 private:
     RefPtrWillBeMember<CustomElementLifecycleCallbacks> m_callbacks;
 };
 
 } // namespace blink
 
 #endif // CustomElementCallbackInvocation_h