Make js-test-post a noop.

LayoutTests/fast/canvas/webgl/resources/webgl-test.js

 //----------------------------------------------------------------------
 // Differences with respect to Khronos version of webgl-test.js
 if (window.testRunner)
     testRunner.overridePreference("WebKitWebGLEnabled", "1");
 
 function assertMsg(assertion, msg) {
     if (assertion) {
         testPassed(msg);
     } else {
         testFailed(msg);
     }
 }
 
 function initNonKhronosFramework(waitUntilDone) {
   if (window.testRunner) {
     testRunner.overridePreference("WebKitWebGLEnabled", "1");
     testRunner.dumpAsText();
     if (waitUntilDone) {
+      window.jsTestIsAsync = true;
       testRunner.waitUntilDone();
     }
   }
 }
 
 function nonKhronosFrameworkNotifyDone() {
   if (window.testRunner) {
     testRunner.notifyDone();
   }
 }
 
 function finishTest() {
-  var epilogue = document.createElement("script")
-  epilogue.onload = function() {
-    if (window.nonKhronosFrameworkNotifyDone) {
-      window.nonKhronosFrameworkNotifyDone();
-    }
-  };
-  epilogue.src = "../../js/resources/js-test-post.js";
-  document.body.appendChild(epilogue);
+  finishJSTest();
 }
 
 //
 //----------------------------------------------------------------------
 
 function webglTestLog(msg) {
   if (window.console && window.console.log) {
     window.console.log(msg);
   }
   if (document.getElementById("console")) {
@@ skipping 745 matching lines @@
     else {
         var newTime = new Date().getTime();
         var t = newTime - this.renderTime;
         var framerate = 1000/t;
         this.framerates.push(framerate);
         while (this.framerates.length > this.numFramerates)
             this.framerates.shift();
         this.renderTime = newTime;
     }
 }