Remove more bits of the Oilpan tracing system

sky/engine/wtf/DefaultAllocator.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
     {
         RELEASE_ASSERT(count <= kMaxUnquantizedAllocation / sizeof(T));
         return partitionAllocActualSize(Partitions::getBufferPartition(), count * sizeof(T));
     }
     static const size_t kMaxUnquantizedAllocation = kGenericMaxDirectMapped;
 };
 
 class DefaultAllocator {
 public:
     typedef DefaultAllocatorQuantizer Quantizer;
-    typedef DefaultAllocatorDummyVisitor Visitor;
     static const bool isGarbageCollected = false;
     template<typename T, typename Traits>
     struct VectorBackingHelper {
         typedef void Type;
     };
     template<typename T>
     struct HashTableBackingHelper {
         typedef void Type;
     };
     template <typename Return, typename Metadata>
@@ skipping 109 matching lines @@
     { \
         ASSERT(location); \
         return location; \
     } \
 private: \
 typedef int __thisIsHereToForceASemicolonAfterThisMacro
 
 using WTF::DefaultAllocator;
 
 #endif // WTF_DefaultAllocator_h