Bug 1313490 - Part 3: Remove expression closure from dom/. r=mrbkap

dom/workers/test/sharedWorker_sharedWorker.js

@@ -72,10 +72,9 @@ onconnect = function(event) {
     throw new Error("'connect' event has data: " + event.data);
   }
 
-  // The expression closures should trigger a warning in debug builds, but NOT
-  // fire error events at us. If we ever actually remove expression closures
-  // (in bug 1083458), we'll need something else to test this case.
-  (function() "Expected console warning: expression closures are deprecated");
+  // Statement after return should trigger a warning, but NOT fire error events
+  // at us.
+  (function() { return; 1; });
 
   event.ports[0].onmessage = function(event) {
     if (!(event instanceof MessageEvent)) {

dom/workers/test/test_sharedWorker.html

@@ -22,7 +22,7 @@
         const sentMessage = "ping";
         const errorFilename = href.substring(0, href.lastIndexOf("/") + 1) +
                               filename;
-        const errorLine = 91;
+        const errorLine = 90;
         const errorColumn = 0;
 
         var worker = new SharedWorker(filename);