Bug 1561178 - Shutdown video bridge for all processes that might be using it. r=jya

Differential Revision: https://phabricator.services.mozilla.com/D36000

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

dom/media/ipc/RDDParent.cpp

@@ -208,6 +208,8 @@ void RDDParent::ActorDestroy(ActorDestroyReason aWhy) {
   }
 #endif
 
+  RemoteDecoderManagerParent::ShutdownVideoBridge();
+
   CrashReporterClient::DestroySingleton();
   XRE_ShutdownChildProcess();
 }

dom/media/ipc/RemoteDecoderManagerParent.cpp

@@ -75,6 +75,7 @@ class RemoteDecoderManagerThreadShutdownObserver : public nsIObserver {
                      const char16_t* aData) override {
     MOZ_ASSERT(strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0);
 
+    RemoteDecoderManagerParent::ShutdownVideoBridge();
     RemoteDecoderManagerParent::ShutdownThreads();
     return NS_OK;
   }