Bug 1407415 - Consolidate media::GetShutdownBarrier() use and return a RefPtr r=dminor

Differential Revision: https://phabricator.services.mozilla.com/D29700

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

dom/media/MediaManager.cpp

@@ -168,24 +168,6 @@ class nsMainThreadPtrHolder<
   nsMainThreadPtrHolder(const nsMainThreadPtrHolder& aOther) = delete;
 };
 
-namespace {
-already_AddRefed<nsIAsyncShutdownClient> GetShutdownPhase() {
-  nsCOMPtr<nsIAsyncShutdownService> svc = mozilla::services::GetAsyncShutdown();
-  MOZ_RELEASE_ASSERT(svc);
-
-  nsCOMPtr<nsIAsyncShutdownClient> shutdownPhase;
-  nsresult rv = svc->GetProfileBeforeChange(getter_AddRefs(shutdownPhase));
-  if (!shutdownPhase) {
-    // We are probably in a content process. We need to do cleanup at
-    // XPCOM shutdown in leakchecking builds.
-    rv = svc->GetXpcomWillShutdown(getter_AddRefs(shutdownPhase));
-  }
-  MOZ_RELEASE_ASSERT(shutdownPhase);
-  MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
-  return shutdownPhase.forget();
-}
-}  // namespace
-
 namespace mozilla {
 
 #ifdef LOG
@@ -2025,8 +2007,6 @@ MediaManager* MediaManager::Get() {
 
     // Prepare async shutdown
 
-    nsCOMPtr<nsIAsyncShutdownClient> shutdownPhase = GetShutdownPhase();
-
     class Blocker : public media::ShutdownBlocker {
      public:
       Blocker()
@@ -2042,7 +2022,7 @@ MediaManager* MediaManager::Get() {
     };
 
     sSingleton->mShutdownBlocker = new Blocker();
-    nsresult rv = shutdownPhase->AddBlocker(
+    nsresult rv = media::GetShutdownBarrier()->AddBlocker(
         sSingleton->mShutdownBlocker, NS_LITERAL_STRING(__FILE__), __LINE__,
         NS_LITERAL_STRING("Media shutdown"));
     MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
@@ -3651,8 +3631,8 @@ void MediaManager::Shutdown() {
           mMediaThread->Stop();
         }
         // Remove async shutdown blocker
-        nsCOMPtr<nsIAsyncShutdownClient> shutdownPhase = GetShutdownPhase();
-        shutdownPhase->RemoveBlocker(sSingleton->mShutdownBlocker);
+        media::GetShutdownBarrier()->RemoveBlocker(
+            sSingleton->mShutdownBlocker);
 
         // we hold a ref to 'self' which is the same as sSingleton
         sSingleton = nullptr;

dom/media/MediaStreamGraph.cpp

@@ -3293,8 +3293,7 @@ MediaStreamGraph* MediaStreamGraph::GetInstance(
       };
 
       gMediaStreamGraphShutdownBlocker = new Blocker();
-      nsCOMPtr<nsIAsyncShutdownClient> barrier = media::GetShutdownBarrier();
-      nsresult rv = barrier->AddBlocker(
+      nsresult rv = media::GetShutdownBarrier()->AddBlocker(
           gMediaStreamGraphShutdownBlocker, NS_LITERAL_STRING(__FILE__),
           __LINE__, NS_LITERAL_STRING("MediaStreamGraph shutdown"));
       MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));

dom/media/systemservices/MediaUtils.cpp

@@ -9,11 +9,11 @@
 namespace mozilla {
 namespace media {
 
-already_AddRefed<nsIAsyncShutdownClient> GetShutdownBarrier() {
+RefPtr<nsIAsyncShutdownClient> GetShutdownBarrier() {
   nsCOMPtr<nsIAsyncShutdownService> svc = services::GetAsyncShutdown();
   MOZ_RELEASE_ASSERT(svc);
 
-  nsCOMPtr<nsIAsyncShutdownClient> barrier;
+  RefPtr<nsIAsyncShutdownClient> barrier;
   nsresult rv = svc->GetProfileBeforeChange(getter_AddRefs(barrier));
   if (!barrier) {
     // We are probably in a content process. We need to do cleanup at
@@ -22,7 +22,7 @@ already_AddRefed<nsIAsyncShutdownClient> GetShutdownBarrier() {
   }
   MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
   MOZ_RELEASE_ASSERT(barrier);
-  return barrier.forget();
+  return barrier;
 }
 
 NS_IMPL_ISUPPORTS(ShutdownBlocker, nsIAsyncShutdownBlocker)

dom/media/systemservices/MediaUtils.h

@@ -132,7 +132,7 @@ class Refcountable<UniquePtr<T>> : public UniquePtr<T> {
 /* Async shutdown helpers
  */
 
-already_AddRefed<nsIAsyncShutdownClient> GetShutdownBarrier();
+RefPtr<nsIAsyncShutdownClient> GetShutdownBarrier();
 
 class ShutdownBlocker : public nsIAsyncShutdownBlocker {
  public:
@@ -162,10 +162,7 @@ class ShutdownTicket final {
       : mBlocker(aBlocker) {}
   NS_INLINE_DECL_REFCOUNTING(ShutdownTicket)
  private:
-  ~ShutdownTicket() {
-    nsCOMPtr<nsIAsyncShutdownClient> barrier = GetShutdownBarrier();
-    barrier->RemoveBlocker(mBlocker);
-  }
+  ~ShutdownTicket() { GetShutdownBarrier()->RemoveBlocker(mBlocker); }
 
   nsCOMPtr<nsIAsyncShutdownBlocker> mBlocker;
 };