Bug 1408333 Get rid of nsIIPCBackgroundChildCreateCallback - part 5 - IPCBlob, r=asuth

dom/file/ipc/IPCBlobInputStreamThread.cpp

@@ -11,7 +11,6 @@
 #include "mozilla/TaskCategory.h"
 #include "mozilla/ipc/BackgroundChild.h"
 #include "mozilla/ipc/PBackgroundChild.h"
-#include "nsIIPCBackgroundChildCreateCallback.h"
 #include "nsXPCOMPrivate.h"
 
 namespace mozilla {
@@ -42,11 +41,8 @@ public:
 };
 
 class MigrateActorRunnable final : public Runnable
-                                 , public nsIIPCBackgroundChildCreateCallback
 {
 public:
-  NS_DECL_ISUPPORTS_INHERITED
-
   explicit MigrateActorRunnable(IPCBlobInputStreamChild* aActor)
     : Runnable("dom::MigrateActorRunnable")
     , mActor(aActor)
@@ -57,22 +53,15 @@ public:
   NS_IMETHOD
   Run() override
   {
-    BackgroundChild::GetOrCreateForCurrentThread(this);
+    MOZ_ASSERT(mActor->State() == IPCBlobInputStreamChild::eInactiveMigrating);
+
+    PBackgroundChild* actorChild =
+      BackgroundChild::GetOrCreateForCurrentThread();
+    if (!actorChild) {
       return NS_OK;
     }
 
-  void
-  ActorFailed() override
-  {
-    // We cannot continue. We are probably shutting down.
-  }
-
-  void
-  ActorCreated(mozilla::ipc::PBackgroundChild* aActor) override
-  {
-    MOZ_ASSERT(mActor->State() == IPCBlobInputStreamChild::eInactiveMigrating);
-
-    if (aActor->SendPIPCBlobInputStreamConstructor(mActor, mActor->ID(),
+    if (actorChild->SendPIPCBlobInputStreamConstructor(mActor, mActor->ID(),
                                                        mActor->Size())) {
       // We need manually to increase the reference for this actor because the
       // IPC allocator method is not triggered. The Release() is called by IPDL
@@ -80,6 +69,8 @@ public:
       mActor.get()->AddRef();
       mActor->Migrated();
     }
+
+    return NS_OK;
   }
 
 private:
@@ -88,9 +79,6 @@ private:
   RefPtr<IPCBlobInputStreamChild> mActor;
 };
 
-NS_IMPL_ISUPPORTS_INHERITED(MigrateActorRunnable, Runnable,
-                  nsIIPCBackgroundChildCreateCallback)
-
 } // anonymous
 
 NS_IMPL_ISUPPORTS(IPCBlobInputStreamThread, nsIObserver, nsIEventTarget)