Bug 1517711 - Guard other uses of SetPullingEnabled too. r=padenot

Depends on D15892

Differential Revision: https://phabricator.services.mozilla.com/D15896

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

dom/media/MediaManager.cpp

@@ -4193,7 +4193,8 @@ SourceListener::InitializeAsync() {
                  state->mTrackEnabled = true;
                  state->mTrackEnabledTime = TimeStamp::Now();
 
-                 if (state == mVideoDeviceState.get()) {
+                 if (state == mVideoDeviceState.get() &&
+                     !mStream->IsDestroyed()) {
                    mStream->SetPullingEnabled(kVideoTrack, true);
                  }
                }

dom/media/webrtc/MediaEngineDefault.cpp

@@ -461,6 +461,9 @@ nsresult MediaEngineDefaultAudioSource::Start(
 
   NS_DispatchToMainThread(
       NS_NewRunnableFunction(__func__, [stream = mStream, track = mTrackID]() {
+        if (stream->IsDestroyed()) {
+          return;
+        }
         stream->SetPullingEnabled(track, true);
       }));
 
@@ -484,6 +487,9 @@ nsresult MediaEngineDefaultAudioSource::Stop(
 
   NS_DispatchToMainThread(
       NS_NewRunnableFunction(__func__, [stream = mStream, track = mTrackID]() {
+        if (stream->IsDestroyed()) {
+          return;
+        }
         stream->SetPullingEnabled(track, false);
       }));
   return NS_OK;

media/webrtc/signaling/src/mediapipeline/MediaPipeline.cpp

@@ -1475,16 +1475,22 @@ class GenericReceiveListener : public MediaStreamTrackListener {
   }
 
   void AddSelf() {
-    if (!mListening) {
-      mListening = true;
+    if (mListening) {
+      return;
+    }
+    mListening = true;
+    mMaybeTrackNeedsUnmute = true;
+    if (!mSource->IsDestroyed()) {
       mSource->SetPullingEnabled(mTrackId, true);
-      mMaybeTrackNeedsUnmute = true;
     }
   }
 
   void RemoveSelf() {
-    if (mListening) {
-      mListening = false;
+    if (!mListening) {
+      return;
+    }
+    mListening = false;
+    if (!mSource->IsDestroyed()) {
       mSource->SetPullingEnabled(mTrackId, false);
     }
   }