Fix TestGCScope in blink_heap_unittests so that it leaves freelists alone.

Source/heap/HeapTest.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 30 matching lines @@
 class TestGCScope {
 public:
     explicit TestGCScope(ThreadState::StackState state)
         : m_state(ThreadState::current())
         , m_safePointScope(state)
     {
         m_state->checkThread();
         ASSERT(!m_state->isInGC());
         ThreadState::stopThreads();
         m_state->enterGC();
-        Heap::makeConsistentForGC();
     }
 
     ~TestGCScope()
     {
         m_state->leaveGC();
         ASSERT(!m_state->isInGC());
         ThreadState::resumeThreads();
     }
 
 private:
@@ skipping 952 matching lines @@
 DEFINE_GC_INFO(ConstructorAllocation);
 DEFINE_GC_INFO(HeapAllocatedArray);
 DEFINE_GC_INFO(IntWrapper);
 DEFINE_GC_INFO(LargeObject);
 DEFINE_GC_INFO(RefCountedAndGarbageCollected);
 DEFINE_GC_INFO(SimpleFinalizedObject);
 DEFINE_GC_INFO(TestTypedHeapClass);
 DEFINE_GC_INFO(TraceCounter);
 
 } // namespace