Remove dead code related to media device enumerations and monitoring.

content/renderer/media/webrtc/webrtc_media_stream_adapter_unittest.cc

 // Copyright 2014 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/webrtc/webrtc_media_stream_adapter.h"
 
 #include <stddef.h>
 
 #include <memory>
 
@@ skipping 36 matching lines @@
         audio ? static_cast<size_t>(1) : 0);
     if (audio) {
       blink::WebMediaStreamSource audio_source;
       audio_source.initialize("audio",
                               blink::WebMediaStreamSource::TypeAudio,
                               "audio",
                               false /* remote */);
       ProcessedLocalAudioSource* const source = new ProcessedLocalAudioSource(
           -1 /* consumer_render_frame_id is N/A for non-browser tests */,
           StreamDeviceInfo(MEDIA_DEVICE_AUDIO_CAPTURE, "Mock audio device",
-                           "mock_audio_device_id", "mock_group_id",
+                           "mock_audio_device_id",
                            media::AudioParameters::kAudioCDSampleRate,
                            media::CHANNEL_LAYOUT_STEREO,
                            media::AudioParameters::kAudioCDSampleRate / 50),
           dependency_factory_.get());
       source->SetAllowInvalidRenderFrameIdForTesting(true);
       source->SetSourceConstraints(
           MockConstraintFactory().CreateWebMediaConstraints());
       audio_source.setExtraData(source);  // Takes ownership.
       audio_track_vector[0].initialize(audio_source);
       EXPECT_CALL(*mock_audio_device_factory_.mock_capturer_source(),
@@ skipping 106 matching lines @@
   EXPECT_TRUE(webrtc_stream()->GetVideoTracks().empty());
 
   native_stream->AddTrack(audio_tracks[0]);
   EXPECT_EQ(1u, webrtc_stream()->GetAudioTracks().size());
 
   native_stream->AddTrack(video_tracks[0]);
   EXPECT_EQ(1u, webrtc_stream()->GetVideoTracks().size());
 }
 
 }  // namespace content