Merge TaskSynchronizer into WaitableEvent.

third_party/WebKit/Source/core/html/parser/HTMLParserThread.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 50 matching lines @@
 }
 
 void HTMLParserThread::shutdown()
 {
     ASSERT(isMainThread());
     ASSERT(s_sharedThread);
     // currentThread will always be non-null in production, but can be null in Chromium unit tests.
     if (Platform::current()->currentThread() && s_sharedThread->m_thread) {
         WaitableEvent waitableEvent;
         s_sharedThread->postTask(crossThreadBind(&HTMLParserThread::cleanupHTMLParserThread, crossThreadUnretained(s_sharedThread), crossThreadUnretained(&waitableEvent)));
-        SafePointScope scope(BlinkGC::HeapPointersOnStack);
         waitableEvent.wait();
     }
     delete s_sharedThread;
     s_sharedThread = nullptr;
 }
 
 void HTMLParserThread::cleanupHTMLParserThread(WaitableEvent* waitableEvent)
 {
     m_thread->shutdown();
     waitableEvent->signal();
 }
 
 HTMLParserThread* HTMLParserThread::shared()
 {
     return s_sharedThread;
 }
 
 void HTMLParserThread::postTask(std::unique_ptr<CrossThreadClosure> closure)
 {
     ASSERT(isMainThread());
     if (!m_thread) {
         m_thread = WebThreadSupportingGC::create("HTMLParserThread");
         postTask(crossThreadBind(&HTMLParserThread::setupHTMLParserThread, crossThreadUnretained(this)));
     }
 
     m_thread->postTask(BLINK_FROM_HERE, std::move(closure));
 }
 
 } // namespace blink