Introduce new constructor to PlatformThread.

webrtc/logging/rtc_event_log/rtc_event_log_helper_thread.cc

 /*
  *  Copyright (c) 2016 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 289 matching lines @@
     // Accumulate a new batch of events instead of processing them one at a
     // time.
     if (message_received) {
       wake_periodically_.Wait(100);
     } else {
       wake_from_hibernation_.Wait(rtc::Event::kForever);
     }
   }
 }
 
-bool RtcEventLogHelperThread::ThreadOutputFunction(void* obj) {
+void RtcEventLogHelperThread::ThreadOutputFunction(void* obj) {
   RtcEventLogHelperThread* helper = static_cast<RtcEventLogHelperThread*>(obj);
   helper->ProcessEvents();
-  return false;
 }
 
 }  // namespace webrtc
 
 #endif  // ENABLE_RTC_EVENT_LOG