Fix pointer compare-and-swap on Windows.

webrtc/base/event_tracer.cc

 /*
  *  Copyright (c) 2012 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.
  */
 #include "webrtc/base/event_tracer.h"
@@ skipping 239 matching lines @@
   g_event_logger->Start(file, true);
   return true;
 }
 
 void StopInternalCapture() {
   g_event_logger->Stop();
 }
 
 void ShutdownInternalTracer() {
   StopInternalCapture();
-  EventLogger* old_logger = rtc::AtomicOps::AtomicLoadPtr(&g_event_logger);
+  EventLogger* old_logger = rtc::AtomicOps::AcquireLoadPtr(&g_event_logger);
   RTC_DCHECK(old_logger);
   RTC_CHECK(rtc::AtomicOps::CompareAndSwapPtr(
                 &g_event_logger, old_logger,
                 static_cast<EventLogger*>(nullptr)) == old_logger);
   delete old_logger;
   webrtc::SetupEventTracer(nullptr, nullptr);
 }
 
 }  // namespace tracing
 }  // namespace rtc