--- a/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
+++ b/dom/media/webrtc/MediaEngineWebRTCAudio.cpp
@@ -442,34 +442,22 @@ MediaEngineWebRTCMicrophoneSource::Updat
   switch (mState) {
     case kReleased:
       MOZ_ASSERT(aHandle);
       if (sChannelsOpen != 0) {
         // Until we fix (or wallpaper) support for multiple mic input
         // (Bug 1238038) fail allocation for a second device
         return NS_ERROR_FAILURE;
       }
-      if (mAudioInput->SetRecordingDevice(mCapIndex)) {
-         return NS_ERROR_FAILURE;
-      }
       mAudioInput->SetUserChannelCount(prefs.mChannels);
       if (!AllocChannel()) {
         FreeChannel();
         LOG(("Audio device is not initalized"));
         return NS_ERROR_FAILURE;
       }
-      LOG(("Audio device %d allocated", mCapIndex));
-      {
-        // Update with the actual applied channelCount in order
-        // to store it in settings.
-        uint32_t channelCount = 0;
-        mAudioInput->GetChannelCount(channelCount);
-        MOZ_ASSERT(channelCount > 0);
-        prefs.mChannels = channelCount;
-      }
       break;
 
     case kStarted:
       if (prefs == mLastPrefs) {
         return NS_OK;
       }
 
       if (prefs.mChannels != mLastPrefs.mChannels) {
@@ -1063,18 +1051,16 @@ MediaEngineWebRTCMicrophoneSource::Shutd
   }
 
   while (mRegisteredHandles.Length()) {
     MOZ_ASSERT(mState == kAllocated || mState == kStopped);
     // on last Deallocate(), FreeChannel()s and DeInit()s if all channels are released
     Deallocate(mRegisteredHandles[0].get());
   }
   MOZ_ASSERT(mState == kReleased);
-
-  mAudioInput = nullptr;
 }
 
 void
 MediaEngineWebRTCAudioCaptureSource::GetName(nsAString &aName) const
 {
   aName.AssignLiteral("AudioCapture");
 }