Delete unused class ComThread.

webrtc/base/thread.h

 /*
  *  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 288 matching lines @@
 
 class AutoThread : public Thread {
  public:
   AutoThread();
   ~AutoThread() override;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(AutoThread);
 };
 
-// Win32 extension for threads that need to use COM
-#if defined(WEBRTC_WIN)
-class ComThread : public Thread {
- public:
-  ComThread() {}
-  ~ComThread() override;
-
- protected:
-  void Run() override;
-
- private:
-  RTC_DISALLOW_COPY_AND_ASSIGN(ComThread);
-};
-#endif
-
 // Provides an easy way to install/uninstall a socketserver on a thread.
 class SocketServerScope {
  public:
   explicit SocketServerScope(SocketServer* ss) {
     old_ss_ = Thread::Current()->socketserver();
     Thread::Current()->set_socketserver(ss);
   }
   ~SocketServerScope() {
     Thread::Current()->set_socketserver(old_ss_);
   }
 
  private:
   SocketServer* old_ss_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SocketServerScope);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_THREAD_H_