[wasm] Enable local iframe test.

third_party/WebKit/LayoutTests/http/tests/wasm/resources/frame.html

 <script>
-  function listener(event) {
-    var mod = event.data;
-    try {
-      var i = new WebAssembly.Instance(mod);
-      var ans = i.exports.increment(42);
-      event.source.postMessage(ans, "*");
-    } catch (e) {
-      event.source.postMessage(e, "*");
-    }
+function listener(event) {
+  var mod = event.data;
+  try {
+    var i = new WebAssembly.Instance(mod);    
+    var ans = i.exports.increment(42);
+    event.source.postMessage(ans, event.origin);
+  } catch (e) {
+    event.source.postMessage(e, event.origin);
   }
+}
 
-  if (window.addEventListener){
-    addEventListener("message", listener, false)
-  } else {
-    attachEvent("onmessage", listener)
-  }
+if (window.addEventListener){
+  addEventListener("message", listener, false)
+} else {
+  attachEvent("onmessage", listener)
+}
 </script>