Make js-test-post a noop.

LayoutTests/fast/encoding/resources/invalid-xml.js

 // test 70: XML encoding test
 // q.v. XML 1.0, section 4.3.3 Character Encoding in Entities
 // this only tests one of a large number of conditions that should cause fatal errors
 
 function runEncodingTest(event)
 {
     debug("Testing: " + encodingTests[currentTest-1]);
     shouldBeEqualToString("iframe.contentDocument.documentElement.tagName", "root");
     shouldBeTrue("iframe.contentDocument.documentElement.getElementsByTagName('test').length < 1");
     setTimeout(runNextTest, 0);
 }
 
 var currentTest = 0;
 var encodingTests = [
     "invalid-xml-utf8.xml",
     "invalid-xml-utf16.xml",
     "invalid-xml-shift-jis.xml",
     "invalid-xml-x-mac-thai.xml",
 ];
 
 function runNextTest()
 {
     if (currentTest >= encodingTests.length) {
-        var script = document.createElement("script");
-        script.src = "../js/resources/js-test-post.js";
-        if (window.testRunner)
-            script.setAttribute("onload", "testRunner.notifyDone()");
-        document.body.appendChild(script);
         iframe.parentNode.removeChild(iframe);
+        finishJSTest();
         return;
     }
     iframe.src = "resources/" + encodingTests[currentTest++];
 }
 
+window.jsTestIsAsync = true;
 if (window.testRunner)
     testRunner.waitUntilDone();
 
 var iframe = document.createElement("iframe");
 document.body.appendChild(iframe);
 iframe.onload = runEncodingTest;
 runNextTest();