Remove cancelMediaDevicesRequest dead code.

content/renderer/media/user_media_client_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/user_media_client_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 #include <vector>
@@ skipping 312 matching lines @@
       MEDIA_DEVICE_VIDEO_CAPTURE,
       security_origin);
 
   media_stream_dispatcher_->EnumerateDevices(
       audio_output_request_id,
       weak_factory_.GetWeakPtr(),
       MEDIA_DEVICE_AUDIO_OUTPUT,
       security_origin);
 }
 
-void UserMediaClientImpl::cancelMediaDevicesRequest(
-    const blink::WebMediaDevicesRequest& media_devices_request) {
-  DCHECK(CalledOnValidThread());
-  MediaDevicesRequestInfo* request =
-      FindMediaDevicesRequestInfo(media_devices_request);
-  if (!request)
-    return;
-  CancelAndDeleteMediaDevicesRequest(request);
-}
-
 void UserMediaClientImpl::requestSources(
     const blink::WebMediaStreamTrackSourcesRequest& sources_request) {
   // We don't call UpdateWebRTCMethodCount() here to track the API count in UMA
   // stats. This is instead counted in MediaStreamTrack::getSources in blink.
   DCHECK(CalledOnValidThread());
 
   int audio_input_request_id = g_next_request_id++;
   int video_input_request_id = g_next_request_id++;
 
   // |sources_request| can't be mocked, so in tests it will be empty (the
@@ skipping 833 matching lines @@
 
 bool UserMediaClientImpl::UserMediaRequestInfo::HasPendingSources() const {
   return !sources_waiting_for_callback_.empty();
 }
 
 void UserMediaClientImpl::OnDestruct() {
   delete this;
 }
 
 }  // namespace content