Fix webkit_unit_tests to use the threaded parser and enable everywhere.

Source/web/tests/AssociatedURLLoaderTest.cpp

Index: Source/web/tests/AssociatedURLLoaderTest.cpp
diff --git a/Source/web/tests/AssociatedURLLoaderTest.cpp b/Source/web/tests/AssociatedURLLoaderTest.cpp
index d9ad0436c8098c0f7b4b0666a9259673b3fccde2..24c0ecab64062e514fd789271d919a925fc57acc 100644
--- a/Source/web/tests/AssociatedURLLoaderTest.cpp
+++ b/Source/web/tests/AssociatedURLLoaderTest.cpp
@@ -101,11 +101,7 @@ public:
             RegisterMockedUrl(urlRoot, iframeSupportFiles[i]);
         }
 
-        WebURLRequest request;
-        request.initialize();
-        request.setURL(url);
-        mainFrame()->loadRequest(request);
-        serveRequests();
+        FrameTestHelpers::loadFrame(mainFrame(), url.string().utf8().data());
 
         Platform::current()->unitTestSupport()->unregisterMockedURL(url);
     }