Remove now-unnecessary VectorTraits specializations.

Source/core/events/NodeEventContext.h

 /*
  * Copyright (C) 2014 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 47 matching lines @@
     void handleLocalEvents(Event*) const;
 
 private:
     RefPtrWillBeMember<Node> m_node;
     RefPtrWillBeMember<EventTarget> m_currentTarget;
     RefPtrWillBeMember<TreeScopeEventContext> m_treeScopeEventContext;
 };
 
 } // namespace blink
 
-#if !ENABLE(OILPAN)
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::NodeEventContext);
-#else
-namespace WTF {
-template <> struct VectorTraits<blink::NodeEventContext> : SimpleClassVectorTraits<blink::NodeEventContext> {
-    static const bool needsDestruction = false;
-};
-}
-#endif
 
 #endif // NodeEventContext_h