Oilpan: Remove duplicated code between HeapPage and LargeObject

Source/platform/heap/ThreadState.cpp

 /*
  * 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 290 matching lines @@
 {
     checkThread();
     ASSERT(!**s_threadSpecific);
     **s_threadSpecific = this;
 
     if (isMainThread()) {
         s_mainThreadStackStart = reinterpret_cast<uintptr_t>(m_startOfStack) - sizeof(void*);
         s_mainThreadUnderestimatedStackSize = StackFrameDepth::getUnderestimatedStackSize() - sizeof(void*);
     }
 
-    for (int heapIndex = 0; heapIndex < NumberOfHeaps; heapIndex++)
-        m_heaps[heapIndex] = new ThreadHeap(this, heapIndex);
+    for (int heapIndex = 0; heapIndex < LargeObjectHeap; heapIndex++)
+        m_heaps[heapIndex] = new ThreadHeapForHeapPage(this, heapIndex);
+    m_heaps[LargeObjectHeap] = new ThreadHeapForLargeObject(this, LargeObjectHeap);
 
     m_weakCallbackStack = new CallbackStack();
 }
 
 ThreadState::~ThreadState()
 {
     checkThread();
     delete m_weakCallbackStack;
     m_weakCallbackStack = nullptr;
     for (int i = 0; i < NumberOfHeaps; ++i)
@@ skipping 992 matching lines @@
         json->beginArray(it->key.ascii().data());
         for (size_t age = 0; age <= maxHeapObjectAge; ++age)
             json->pushInteger(it->value.ages[age]);
         json->endArray();
     }
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("blink_gc"), statsName, this, json.release());
 }
 #endif
 
 } // namespace blink