Implement callback reactions for Custom Elements V1

third_party/WebKit/Source/core/dom/custom/CustomElementUpgradeReaction.cpp

 // Copyright 2016 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 "core/dom/custom/CustomElementUpgradeReaction.h"
 
-#include "core/dom/Element.h"
 #include "core/dom/custom/CustomElementDefinition.h"
 
 namespace blink {
 
 CustomElementUpgradeReaction::CustomElementUpgradeReaction(
     CustomElementDefinition* definition)
-    : m_definition(definition)
+    : CustomElementReaction(definition)
 {
 }
 
-CustomElementUpgradeReaction::~CustomElementUpgradeReaction() = default;
-
-DEFINE_TRACE(CustomElementUpgradeReaction)
-{
-    CustomElementReaction::trace(visitor);
-    visitor->trace(m_definition);
-}
-
 void CustomElementUpgradeReaction::invoke(Element* element)
 {
     m_definition->upgrade(element);
 }
 
 } // namespace blink