Remove cancelMediaDevicesRequest dead code.

third_party/WebKit/Source/web/UserMediaClientImpl.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
     if (m_client)
         m_client->cancelUserMediaRequest(WebUserMediaRequest(request));
 }
 
 void UserMediaClientImpl::requestMediaDevices(MediaDevicesRequest* request)
 {
     if (m_client)
         m_client->requestMediaDevices(request);
 }
 
-void UserMediaClientImpl::cancelMediaDevicesRequest(MediaDevicesRequest* request)
-{
-    if (m_client)
-        m_client->cancelMediaDevicesRequest(WebMediaDevicesRequest(request));
-}
-
 void UserMediaClientImpl::requestSources(MediaStreamTrackSourcesRequest* request)
 {
     if (m_client)
         m_client->requestSources(request);
 }
 
 void UserMediaClientImpl::setMediaDeviceChangeObserver(MediaDevices* observer)
 {
     if (m_client)
         m_client->setMediaDeviceChangeObserver(WebMediaDeviceChangeObserver(observer));
 }
 
 } // namespace blink