Oilpan: remove unused tracking of freelist tails.

Source/platform/heap/Heap.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 714 matching lines @@
 private:
     // Returns a bucket number for inserting a FreeListEntry of a
     // given size. All FreeListEntries in the given bucket, n, have
     // size >= 2^n.
     static int bucketIndexForSize(size_t);
 
     int m_biggestFreeListIndex;
 
     // All FreeListEntries in the nth list have size >= 2^n.
     FreeListEntry* m_freeLists[blinkPageSizeLog2];
-    FreeListEntry* m_lastFreeListEntries[blinkPageSizeLog2];
 
     friend class ThreadHeap<Header>;
 };
 
 // Thread heaps represent a part of the per-thread Blink heap.
 //
 // Each Blink thread has a number of thread heaps: one general heap
 // that contains any type of object and a number of heaps specialized
 // for specific object types (such as Node).
 //
@@ skipping 1570 matching lines @@
 template<typename T, size_t inlineCapacity>
 struct GCInfoTrait<HeapVector<T, inlineCapacity> > : public GCInfoTrait<Vector<T, inlineCapacity, HeapAllocator> > { };
 template<typename T, size_t inlineCapacity>
 struct GCInfoTrait<HeapDeque<T, inlineCapacity> > : public GCInfoTrait<Deque<T, inlineCapacity, HeapAllocator> > { };
 template<typename T, typename U, typename V>
 struct GCInfoTrait<HeapHashCountedSet<T, U, V> > : public GCInfoTrait<HashCountedSet<T, U, V, HeapAllocator> > { };
 
 } // namespace blink
 
 #endif // Heap_h