Bug 1524648 - Relax assertion in MediaEngineWebRTCMicrophoneSource::Deallocate to take into account the fact that starting the device can have failed. r=pehrsons

Differential Revision: https://phabricator.services.mozilla.com/D18979

--HG--
extra : moz-landing-system : lando

dom/media/webrtc/MediaEngineWebRTCAudio.cpp

@@ -443,7 +443,7 @@ nsresult MediaEngineWebRTCMicrophoneSource::Deallocate(
     const RefPtr<const AllocationHandle>&) {
   AssertIsOnOwningThread();
 
-  MOZ_ASSERT(mState == kStopped);
+  MOZ_ASSERT(mState == kStopped || mState == kAllocated);
 
   class EndTrackMessage : public ControlMessage {
    public: