Oilpan: Remove GarbageCollected::ref/deref

Source/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 852 matching lines @@
     void* operator new(size_t size)
     {
         return Heap::allocate<T>(size);
     }
 
     void operator delete(void* p)
     {
         ASSERT_NOT_REACHED();
     }
 
-    // FIXME: These methods are needed to make transition types compilable.
-    // Remove the methods once transition types are gone.
-    void ref()
-    {
-        ASSERT_NOT_REACHED();
-    }
-    void deref()
-    {
-        ASSERT_NOT_REACHED();
-    }
-
 protected:
     GarbageCollected()
     {
         ASSERT(ThreadStateFor<ThreadingTrait<T>::Affinity>::state()->contains(reinterpret_cast<Address>(this)));
     }
     ~GarbageCollected() { }
 };
 
 // Base class for objects allocated in the Blink garbage-collected
 // heap.
@@ skipping 779 matching lines @@
 // to export. This forces it to export all the methods from ThreadHeap.
 template<> void ThreadHeap<FinalizedHeapObjectHeader>::addPageToHeap(const GCInfo*);
 template<> void ThreadHeap<HeapObjectHeader>::addPageToHeap(const GCInfo*);
 extern template class HEAP_EXPORT ThreadHeap<FinalizedHeapObjectHeader>;
 extern template class HEAP_EXPORT ThreadHeap<HeapObjectHeader>;
 #endif
 
 }
 
 #endif // Heap_h