Fix abort-on-changestate-headers-received.html so it passes

third_party/WebKit/LayoutTests/resources/js-test.js

 // js-test now supports lazily printing test results which dumps all test
 // results once at the end of the test instead of building them up. To enable
 // this option, call setPrintTestResultsLazily() before running any tests.
 var _lazyTestResults; // Set by setPrintTestResultsLazily().
 var _lazyDescription; // Set by description() after setPrintTestResultsLazily().
 
 // svg/dynamic-updates tests set enablePixelTesting=true, as we want to dump text + pixel results
 if (self.testRunner) {
     if (self.enablePixelTesting)
         testRunner.dumpAsTextWithPixelResults();
@@ skipping 747 matching lines @@
     testFailed("expectError() not called before shouldHaveHadError()");
 }
 
 // With Oilpan tests that rely on garbage collection need to go through
 // the event loop in order to get precise garbage collections. Oilpan
 // uses conservative stack scanning when not at the event loop and that
 // can artificially keep objects alive. Therefore, tests that need to check
 // that something is dead need to use this asynchronous collectGarbage
 // function.
 function asyncGC(callback) {
+    var documentsBefore = window.internals.numberOfLiveDocuments();
     GCController.collectAll();
     // FIXME: we need a better way of waiting for chromium events to happen
-    setTimeout(callback, 0);
+    setTimeout(function () {
+        var documentsAfter = window.internals.numberOfLiveDocuments();
+        if (documentsAfter < documentsBefore)
+            asyncGC(callback);
+        else
+            callback();
+    }, 0);
 }
 
 function gc() {
     if (typeof GCController !== "undefined")
         GCController.collectAll();
     else {
         var gcRec = function (n) {
             if (n < 1)
                 return {};
             var temp = {i: "ab" + i + (i / 100000)};
@@ skipping 132 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }