Delete unused class ComThread.

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 500 matching lines @@
   }
 }
 
 AutoThread::~AutoThread() {
   Stop();
   if (ThreadManager::Instance()->CurrentThread() == this) {
     ThreadManager::Instance()->SetCurrentThread(nullptr);
   }
 }
 
-#if defined(WEBRTC_WIN)
-ComThread::~ComThread() {
-  Stop();
-}
-
-void ComThread::Run() {
-  HRESULT hr = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
-  RTC_DCHECK(SUCCEEDED(hr));
-  if (SUCCEEDED(hr)) {
-    Thread::Run();
-    CoUninitialize();
-  } else {
-    LOG(LS_ERROR) << "CoInitialize failed, hr=" << hr;
-  }
-}
-#endif
-
 }  // namespace rtc