Copied from https://hg.mozilla.org/releases/mozilla-esr38/raw-rev/e7c23c08bf84

# HG changeset patch
# User Randell Jesup <rjesup@jesup.org>
# Date 1458543433 14400
# Node ID e7c23c08bf84a02d9154f31e0c5d121a45884a69
# Parent  a6de1f453712edabff597879398606708c191098
Bug 1254876: assert windows recording is shut down r=pkerr a=ritu

MozReview-Commit-ID: JRqxBb5TgrE

diff --git a/media/webrtc/trunk/webrtc/modules/audio_device/win/audio_device_core_win.cc b/media/webrtc/trunk/webrtc/modules/audio_device/win/audio_device_core_win.cc
--- a/media/webrtc/trunk/webrtc/modules/audio_device/win/audio_device_core_win.cc
+++ b/media/webrtc/trunk/webrtc/modules/audio_device/win/audio_device_core_win.cc
@@ -567,16 +567,19 @@ AudioDeviceWindowsCore::AudioDeviceWindo
 // ----------------------------------------------------------------------------
 
 AudioDeviceWindowsCore::~AudioDeviceWindowsCore()
 {
     WEBRTC_TRACE(kTraceMemory, kTraceAudioDevice, _id, "%s destroyed", __FUNCTION__);
 
     Terminate();
 
+    // Recording thread should be shut down before this!
+    assert(_hRecThread == NULL);
+
     // The IMMDeviceEnumerator is created during construction. Must release
     // it here and not in Terminate() since we don't recreate it in Init().
     SAFE_RELEASE(_ptrEnumerator);
 
     _ptrAudioBuffer = NULL;
 
     if (NULL != _hRenderSamplesReadyEvent)
     {