Revert of Protect MessageQueue stop field with a critical section to avoid data races.

webrtc/base/thread.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 200 matching lines @@
   }
   return true;
 }
 
 bool Thread::Start(Runnable* runnable) {
   ASSERT(owned_);
   if (!owned_) return false;
   ASSERT(!running());
   if (running()) return false;
 
-  Restart();  // reset IsQuitting() if the thread is being restarted
+  Restart();  // reset fStop_ if the thread is being restarted
 
   // Make sure that ThreadManager is created on the main thread before
   // we start a new thread.
   ThreadManager::Instance();
 
   ThreadInit* init = new ThreadInit;
   init->thread = this;
   init->runnable = runnable;
 #if defined(WEBRTC_WIN)
   thread_ = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)PreRun, init, 0,
@@ skipping 107 matching lines @@
 
 void Thread::Stop() {
   MessageQueue::Quit();
   Join();
 }
 
 void Thread::Send(const Location& posted_from,
                   MessageHandler* phandler,
                   uint32_t id,
                   MessageData* pdata) {
-  if (IsQuitting())
+  if (fStop_)
     return;
 
   // Sent messages are sent to the MessageHandler directly, in the context
   // of "thread", like Win32 SendMessage. If in the right context,
   // call the handler directly.
   Message msg;
   msg.posted_from = posted_from;
   msg.phandler = phandler;
   msg.message_id = id;
   msg.pdata = pdata;
@@ skipping 199 matching lines @@
   if (SUCCEEDED(hr)) {
     Thread::Run();
     CoUninitialize();
   } else {
     LOG(LS_ERROR) << "CoInitialize failed, hr=" << hr;
   }
 }
 #endif
 
 }  // namespace rtc