Simplify pre+post GC ThreadState steps.

third_party/WebKit/Source/platform/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 262 matching lines @@
 
 }  // namespace WTF
 
 namespace blink {
 
 class TestGCScope {
  public:
   explicit TestGCScope(BlinkGC::StackState state)
       : m_state(ThreadState::current()), m_safePointScope(state) {
     ASSERT(m_state->checkThread());
-    m_state->heap().preGC();
+    m_state->preGC();
   }
 
   ~TestGCScope() {
-    m_state->heap().postGC(BlinkGC::GCWithSweep);
-    m_state->heap().preSweep(BlinkGC::GCWithSweep);
+    m_state->postGC(BlinkGC::GCWithSweep);
+    m_state->preSweep(BlinkGC::GCWithSweep);
   }
 
  private:
   ThreadState* m_state;
   SafePointScope m_safePointScope;
 };
 
 class SimpleObject : public GarbageCollected<SimpleObject> {
  public:
   static SimpleObject* create() { return new SimpleObject(); }
@@ skipping 6046 matching lines @@
       "HeapVector");
   static_assert(
       WTF::IsGarbageCollectedType<HeapDeque<Member<IntWrapper>>>::value,
       "HeapDeque");
   static_assert(WTF::IsGarbageCollectedType<
                     HeapTerminatedArray<Member<IntWrapper>>>::value,
                 "HeapTerminatedArray");
 }
 
 }  // namespace blink