Remove dead code related to media device enumerations and monitoring.

content/renderer/media/mock_media_stream_registry.cc

 // Copyright (c) 2013 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/mock_media_stream_registry.h"
 
 #include <string>
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/renderer/media/media_stream.h"
@@ skipping 15 matching lines @@
  public:
   MockCDQualityAudioSource() : MediaStreamAudioSource(true) {
     MediaStreamAudioSource::SetFormat(media::AudioParameters(
         media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
         media::CHANNEL_LAYOUT_STEREO,
         media::AudioParameters::kAudioCDSampleRate,
         16,
         media::AudioParameters::kAudioCDSampleRate / 100));
     MediaStreamAudioSource::SetDeviceInfo(StreamDeviceInfo(
         MEDIA_DEVICE_AUDIO_CAPTURE, "Mock audio device", "mock_audio_device_id",
-        "mock_group_id", media::AudioParameters::kAudioCDSampleRate,
+        media::AudioParameters::kAudioCDSampleRate,
         media::CHANNEL_LAYOUT_STEREO,
         media::AudioParameters::kAudioCDSampleRate / 100));
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockCDQualityAudioSource);
 };
 
 }  // namespace
 
@@ skipping 49 matching lines @@
 
   test_stream_.addTrack(blink_track);
 }
 
 blink::WebMediaStream MockMediaStreamRegistry::GetMediaStream(
     const std::string& url) {
   return (url != stream_url_) ? blink::WebMediaStream() : test_stream_;
 }
 
 }  // namespace content