Make XHR use the background HTML parser

LayoutTests/http/tests/xmlhttprequest/xmlhttprequest-responseXML-abort.html

Index: LayoutTests/http/tests/xmlhttprequest/xmlhttprequest-responseXML-abort.html
diff --git a/LayoutTests/http/tests/xmlhttprequest/xmlhttprequest-responseXML-abort.html b/LayoutTests/http/tests/xmlhttprequest/xmlhttprequest-responseXML-abort.html
index 0f0b4f38b47aa270d1437e38b7f55764c44eb4af..bcf467539b4b1b24a295677167816b74a00ccc34 100644
--- a/LayoutTests/http/tests/xmlhttprequest/xmlhttprequest-responseXML-abort.html
+++ b/LayoutTests/http/tests/xmlhttprequest/xmlhttprequest-responseXML-abort.html
@@ -3,18 +3,28 @@
 <script>
 jsTestIsAsync = true;
 
-var xhr = new XMLHttpRequest();
-xhr.responseType = 'document';
-xhr.onreadystatechange = function () {
-    if (this.readyState == XMLHttpRequest.LOADING) {
-        xhr.abort();
-        requestAnimationFrame(function() {
-            debug("PASS if no crash or leak.");
-            testRunner.notifyDone();
-        });
-    }
-};
+function testXHRAbortForURI(uri, testDone) {
+    debug("Start testing for URI: " + uri);
+
+    var xhr = new XMLHttpRequest();
+    xhr.responseType = 'document';
+    xhr.onreadystatechange = function () {
+        if (this.readyState == XMLHttpRequest.LOADING) {
+            xhr.abort();
+            debug("Aborted XHR during LOADING state.");
+            requestAnimationFrame(testDone);
+        }
+    };
+
+    xhr.open("GET", uri, true);
+    xhr.send(null);
+}
+
+testXHRAbortForURI("resources/small-chunks.cgi", function() {
+    testXHRAbortForURI("resources/xml-small-chunks.cgi", function() {
+        debug("PASS if no crash or leak.");
+        finishJSTest();
+    });
+});
 
-xhr.open("GET", "resources/small-chunks.cgi", true);
-xhr.send(null);
 </script>