Unify and provide one IsGarbageCollectedType<T> implementation.

third_party/WebKit/Source/core/svg/graphics/filters/SVGFilterBuilder.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 48 matching lines @@
     }
 
     // Required to change the attributes of a filter during an svgAttributeChanged.
     inline FilterEffect* effectByRenderer(LayoutObject* object) { return m_effectRenderer.get(object); }
 
     void invalidateDependentEffects(FilterEffect*);
 
     DECLARE_TRACE();
 
 private:
-    SVGFilterGraphNodeMap() = default;
+    SVGFilterGraphNodeMap();
 
     // The value is a list, which contains those filter effects,
     // which depends on the key filter effect.
     HeapHashMap<Member<FilterEffect>, FilterEffectSet> m_effectReferences;
     HeapHashMap<LayoutObject*, Member<FilterEffect>> m_effectRenderer;
 };
 
 class SVGFilterBuilder {
     STACK_ALLOCATED();
 public:
@@ skipping 17 matching lines @@
     NamedFilterEffectMap m_builtinEffects;
     NamedFilterEffectMap m_namedEffects;
 
     Member<FilterEffect> m_lastEffect;
     Member<SVGFilterGraphNodeMap> m_nodeMap;
 };
 
 } // namespace blink
 
 #endif // SVGFilterBuilder_h