Simplify prefinalizer processing.

third_party/WebKit/Source/platform/heap/TraceTraits.h

 // Copyright 2015 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.
 
 #ifndef TraceTraits_h
 #define TraceTraits_h
 
 #include "platform/heap/GCInfo.h"
 #include "platform/heap/Heap.h"
 #include "platform/heap/InlinedGlobalMarkingVisitor.h"
 #include "platform/heap/Visitor.h"
 #include "wtf/Assertions.h"
 #include "wtf/Deque.h"
 #include "wtf/HashCountedSet.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/HashTable.h"
 #include "wtf/LinkedHashSet.h"
 #include "wtf/ListHashSet.h"
 #include "wtf/TypeTraits.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 template<typename T> class CrossThreadPersistent;
 template<typename T> class CrossThreadWeakPersistent;
-template<typename T> struct GCInfoTrait;
-class HeapObjectHeader;
 template<typename T> class Member;
 template<typename T> class TraceTrait;
 template<typename T> class WeakMember;
 template<typename T> class WeakPersistent;
 
 template<typename T, bool = NeedsAdjustAndMark<T>::value> class AdjustAndMarkTrait;
 
 template<typename T>
 class AdjustAndMarkTrait<T, false> {
 public:
@@ skipping 530 matching lines @@
         // since iterating over the hash table backing will find the whole
         // chain.
         visitor->markNoTracing(node);
         return false;
     }
 };
 
 } // namespace WTF
 
 #endif