Bug 1372453 - Part 2: Name the caller of ProxyReleaseEvent. r=billm

MozReview-Commit-ID: LYhSWnZkq0i

js/xpconnect/loader/ScriptPreloader.cpp

@@ -650,7 +650,7 @@ ScriptPreloader::Run()
     Unused << NS_WARN_IF(result.isErr());
 
     mSaveComplete = true;
-    NS_ReleaseOnMainThread(mSaveThread.forget());
+    NS_ReleaseOnMainThread("ScriptPreloader::mSaveThread", mSaveThread.forget());
 
     mal.NotifyAll();
     return NS_OK;