Predeclare globals required by the test framework to avoid walking the prototype chain.

LayoutTests/resources/js-test.js

 // svg/dynamic-updates tests set enablePixelTesting=true, as we want to dump text + pixel results
 if (self.testRunner) {
     if (self.enablePixelTesting)
         testRunner.dumpAsTextWithPixelResults();
     else
         testRunner.dumpAsText();
 }
 
 var isJsTest = true;
 
@@ skipping 708 matching lines @@
 }
 
 function isSuccessfullyParsed()
 {
     // FIXME: Remove this and only report unexpected syntax errors.
     successfullyParsed = !unexpectedErrorMessage;
     shouldBeTrue("successfullyParsed");
     debug('<br /><span class="pass">TEST COMPLETE</span>');
 }
 
+var wasPostTestScriptParsed, wasFinishJSTestCalled, jsTestIsAsync;
+
 // It's possible for an async test to call finishJSTest() before js-test-post.js
 // has been parsed.
 function finishJSTest()
 {
     wasFinishJSTestCalled = true;
     if (!self.wasPostTestScriptParsed)
         return;
     isSuccessfullyParsed();
     if (self.jsTestIsAsync && self.testRunner)
         testRunner.notifyDone();
@@ skipping 72 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }