Stop using script-tests in fast/dom/.

third_party/WebKit/LayoutTests/fast/dom/Window/resources/postmessage-test.js

 if (window.testRunner) {
     testRunner.dumpAsText();
     testRunner.waitUntilDone();
 }
 
 var console = document.getElementById("console");
 
 var messages = [];
 var evalThunks = [];
 
@@ skipping 166 matching lines @@
         if (shouldThrow) {
             if (expectedException === undefined || expectedException == e.code || expectedException == e || e instanceof expectedException) {
                 console.innerHTML += "PASS: 'postMessage("+message+")' threw " + escapeHTML(e) + "<br>";
             } else {
                 console.innerHTML += "FAIL: 'postMessage("+message+")' threw " + escapeHTML(e) + ", was expecting " + escapeHTML(expectedException) + "<br>";
             }
         } else
             console.innerHTML += "FAIL: 'postMessage("+message+")' should not throw but threw " + e + "<br>";
     }
 }