--- a/media/mtransport/runnable_utils.h
+++ b/media/mtransport/runnable_utils.h
@@ -23,36 +23,17 @@ namespace detail {
 enum RunnableResult {
   NoResult,
   ReturnsResult
 };
 
 static inline nsresult
 RunOnThreadInternal(nsIEventTarget *thread, nsIRunnable *runnable, uint32_t flags)
 {
-  nsCOMPtr<nsIRunnable> runnable_ref(runnable);
-  if (thread) {
-    bool on;
-    nsresult rv;
-    rv = thread->IsOnCurrentThread(&on);
-
-    // If the target thread has already shut down, we don't want to assert.
-    if (rv != NS_ERROR_NOT_INITIALIZED) {
-      MOZ_ASSERT(NS_SUCCEEDED(rv));
-    }
-
-    if (NS_WARN_IF(NS_FAILED(rv))) {
-      // we're going to destroy the runnable on this thread!
-      return rv;
-    }
-    if (!on) {
-      return thread->Dispatch(runnable_ref.forget(), flags);
-    }
-  }
-  return runnable_ref->Run();
+  return thread->Dispatch(runnable, flags);
 }
 
 template<RunnableResult result>
 class runnable_args_base : public Runnable {
  public:
   runnable_args_base() : Runnable("media-runnable_args_base") {}
 
   NS_IMETHOD Run() override = 0;