Revert of Delete SignalThread class.

webrtc/rtc_base/messagequeue.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.
  */
 #include <algorithm>
@@ skipping 25 matching lines @@
     *processing_ -= 1;
     cs_->Leave();
   }
 
  private:
   const CriticalSection* const cs_;
   size_t* processing_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(MarkProcessingCritScope);
 };
-
-class FunctorPostMessageHandler : public MessageHandler {
- public:
-  void OnMessage(Message* msg) override {
-    RunnableData* data = static_cast<RunnableData*>(msg->pdata);
-    data->Run();
-    delete data;
-  }
-};
-
 }  // namespace
 
 //------------------------------------------------------------------
 // MessageQueueManager
 
 MessageQueueManager* MessageQueueManager::instance_ = nullptr;
 
 MessageQueueManager* MessageQueueManager::Instance() {
   // Note: This is not thread safe, but it is first called before threads are
   // spawned.
@@ skipping 473 matching lines @@
   int64_t start_time = TimeMillis();
   pmsg->phandler->OnMessage(pmsg);
   int64_t end_time = TimeMillis();
   int64_t diff = TimeDiff(end_time, start_time);
   if (diff >= kSlowDispatchLoggingThreshold) {
     LOG(LS_INFO) << "Message took " << diff << "ms to dispatch. Posted from: "
                  << pmsg->posted_from.ToString();
   }
 }
 
-void MessageQueue::PostFunctorInternal(const Location& posted_from,
-                                       RunnableData* message_data) {
-  // Use static to ensure it outlives this scope. Safe since
-  // FunctorPostMessageHandler keeps no state.
-  static FunctorPostMessageHandler handler;
-  Post(posted_from, &handler, 0, message_data);
-}
-
 }  // namespace rtc