Remove MediaStreamDeviceThread in favor of using AudioThread.

tools/metrics/histograms/histograms.xml

 <!--
 Copyright 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.
 -->
 
 <!--
 This file is used to generate a comprehensive list of Chrome histograms along
 with a detailed description for each histogram.
 
@@ skipping 3528 matching lines @@
 </histogram>
 
 <histogram name="Media.AudioCodec" enum="AudioCodec">
   <summary>Audio codec used in HTML5 media.</summary>
 </histogram>
 
 <histogram name="Media.AudioInputController" units="ms">
   <summary>Measures the time taken for AudioInputController::</summary>
 </histogram>
 
+<histogram name="Media.AudioInputDeviceManager" units="ms">
+  <summary>Measures the time taken for AudioInputDeviceManager::</summary>
+</histogram>
+
 <histogram name="Media.AudioOutputController" units="ms">
   <summary>Measures the time taken for AudioOutputController::</summary>
 </histogram>
 
 <histogram name="Media.AudioOutputControllerDataNotReady" units="ms">
   <summary>
     Time spent waiting in AudioOutputController::WaitTillDataReady() if the data
     was not initially available.
   </summary>
 </histogram>
@@ skipping 412 matching lines @@
     URL scheme used with HTML5 media. (each URL provides one sample)
   </summary>
 </histogram>
 
 <histogram name="Media.VAVDAH264.DecoderFailure" enum="VAVDAH264DecoderFailure">
   <summary>
     Error codes reported by video decode using VA-API hardware video decoder.
   </summary>
 </histogram>
 
+<histogram name="Media.VideoCaptureManager" units="ms">
+  <summary>Measures the time taken for VideoCaptureManager::</summary>
+</histogram>
+
 <histogram name="Media.VideoCodec" enum="VideoCodec">
   <summary>Video codec used in HTML5 media.</summary>
 </histogram>
 
 <histogram name="Media.VideoCodecProfile" enum="VideoCodecProfile">
   <summary>Video codec profile used in HTML5 media.</summary>
 </histogram>
 
 <histogram name="Media.VideoCodedAspectRatio">
   <summary>Coded aspect ratio of HTML5 video.</summary>
@@ skipping 14720 matching lines @@
   <affected-histogram name="LevelDBEnv.TimeTo"/>
 </fieldtrial>
 
 <fieldtrial name="MediaAudioInputControllerTime" separator=".">
   <group name="CloseTime" label="Measures the time taken for DoClose()."/>
   <group name="CreateTime" label="Measures the time taken for DoCreate()."/>
   <group name="RecordTime" label="Measures the time taken for DoRecord()."/>
   <affected-histogram name="Media.AudioInputController"/>
 </fieldtrial>
 
+<fieldtrial name="MediaAudioInputDeviceManagerTime" separator=".">
+  <group name="OpenOnDeviceThreadTime"
+      label="Measures the time taken for OpenOnDeviceThread()."/>
+  <group name="EnumerateOnDeviceThreadTime"
+      label="Measures the time taken for EnumerateOnDeviceThread()."/>
+  <affected-histogram name="Media.AudioInputDeviceManager"/>
+</fieldtrial>
+
 <fieldtrial name="MediaAudioOutputControllerTime" separator=".">
   <group name="CloseTime" label="Measures the time taken for DoClose()."/>
   <group name="CreateTime" label="Measures the time taken for DoCreate()."/>
   <group name="DeviceChangeTime"
       label="Measures the time taken for OnDeviceChange()."/>
   <group name="PauseTime" label="Measures the time taken for DoPause()."/>
   <group name="PlayTime"
       label="Measures the time taken for DoPlay(). Technically only the
              worker method AudioOutputController::PollAndStartIfDataReady()."/>
   <affected-histogram name="Media.AudioOutputController"/>
 </fieldtrial>
 
+<fieldtrial name="MediaVideoCaptureManagerTime" separator=".">
+  <group name="OnEnumerateDevicesTime"
+      label="Measures the time taken for OnEnumerateDevices()."/>
+  <group name="OnOpenTime" label="Measures the time taken for OnOpen()."/>
+  <group name="OnCloseTime" label="Measures the time taken for OnClose()."/>
+  <group name="OnStartTime" label="Measures the time taken for OnStart()."/>
+  <group name="OnStopTime" label="Measures the time taken for OnStop()."/>
+  <affected-histogram name="Media.VideoCaptureManager"/>
+</fieldtrial>
+
 <fieldtrial name="NetConnectivity" separator=".">
   <group name="53.100B" label="100 bytes of data on port 53."/>
   <group name="53.100B.NoProxy"
       label="100 bytes of data on port 53 with no proxy."/>
   <group name="53.1K" label="1K bytes of data on port 53."/>
   <group name="53.1K.NoProxy"
       label="1K bytes of data on port 53 with no proxy."/>
   <group name="53.100B.RTT" label="100 bytes of data on port 53 successfully."/>
   <group name="53.100B.RTT.NoProxy"
       label="100 bytes of data on port 53 successfully with no proxy."/>
@@ skipping 1081 matching lines @@
   <group name="Disabled" label="Neither extra webstore link is visible"/>
   <group name="FooterLink" label="Link in bottom right of footer"/>
   <group name="PlusIcon" label="Plus icon in apps page"/>
   <affected-histogram name="Extensions.AppLaunch"/>
   <affected-histogram name="NewTabPage.DefaultPageType"/>
 </fieldtrial>
 
 </fieldtrials>
 
 </histogram-configuration>