Simplify pre+post GC ThreadState steps.

third_party/WebKit/Source/platform/heap/Heap.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 295 matching lines @@
   compaction()->registerMovingObjectCallback(reference, callback, callbackData);
 }
 
 void ThreadHeap::decommitCallbackStacks() {
   m_markingStack->decommit();
   m_postMarkingCallbackStack->decommit();
   m_weakCallbackStack->decommit();
   m_ephemeronStack->decommit();
 }
 
-void ThreadHeap::preGC() {
-  ASSERT(!ThreadState::current()->isInGC());
-  m_threadState->preGC();
-}
-
-void ThreadHeap::postGC(BlinkGC::GCType gcType) {
-  ASSERT(ThreadState::current()->isInGC());
-  m_threadState->postGC(gcType);
-}
-
-void ThreadHeap::preSweep(BlinkGC::GCType gcType) {
-  m_threadState->preSweep(gcType);
-}
-
 void ThreadHeap::processMarkingStack(Visitor* visitor) {
   // Ephemeron fixed point loop.
   do {
     {
       // Iteratively mark all objects that are reachable from the objects
       // currently pushed onto the marking stack.
       TRACE_EVENT0("blink_gc", "ThreadHeap::processMarkingStackSingleThreaded");
       while (popAndInvokeTraceCallback(visitor)) {
       }
     }
@@ skipping 175 matching lines @@
   ProcessHeap::decreaseTotalAllocatedObjectSize(m_stats.allocatedObjectSize());
   ProcessHeap::decreaseTotalMarkedObjectSize(m_stats.markedObjectSize());
 
   m_stats.reset();
   m_threadState->resetHeapCounters();
 }
 
 ThreadHeap* ThreadHeap::s_mainThreadHeap = nullptr;
 
 }  // namespace blink