Bug 1735299 - Remove last use of unnammed NS_ReleaseOnMainThread r=extension-reviewers,rpl,nhnt11

Differential Revision: https://phabricator.services.mozilla.com/D128177

toolkit/components/extensions/webidl-api/ExtensionEventListener.h

@@ -155,7 +155,8 @@ class ExtensionListenerCallWorkerRunnable : public dom::WorkerRunnable {
 
  private:
   ~ExtensionListenerCallWorkerRunnable() {
-    NS_ReleaseOnMainThread(mPromiseResult.forget());
+    NS_ReleaseOnMainThread("~ExtensionListenerCallWorkerRunnable",
+                           mPromiseResult.forget());
     ReleaseArgsHolder();
     mListener = nullptr;
   }

xpcom/threads/nsProxyRelease.h

@@ -185,13 +185,6 @@ inline NS_HIDDEN_(void)
   NS_ProxyRelease(aName, target, doomed.forget(), aAlwaysProxy);
 }
 
-template <class T>
-inline NS_HIDDEN_(void) NS_ReleaseOnMainThread(already_AddRefed<T> aDoomed,
-                                               bool aAlwaysProxy = false) {
-  NS_ReleaseOnMainThread("NS_ReleaseOnMainThread", std::move(aDoomed),
-                         aAlwaysProxy);
-}
-
 /**
  * Class to safely handle main-thread-only pointers off the main thread.
  *