Fix webkit_unit_tests to use the threaded parser and enable everywhere.

Source/web/tests/MHTMLTest.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 64 matching lines @@
         Platform::current()->unitTestSupport()->unregisterAllMockedURLs();
     }
 
     void registerMockedURLLoad(const std::string& url, const WebString& fileName)
     {
         URLTestHelpers::registerMockedURLLoad(toKURL(url), fileName, WebString::fromUTF8("mhtml/"), WebString::fromUTF8("text/html"));
     }
 
     void loadURLInTopFrame(const WebURL& url)
     {
-        WebURLRequest urlRequest;
-        urlRequest.initialize();
-        urlRequest.setURL(url);
-        m_helper.webView()->mainFrame()->loadRequest(urlRequest);
-        // Make sure any pending request get served.
-        Platform::current()->unitTestSupport()->serveAsynchronousMockedRequests();
+        FrameTestHelpers::loadFrame(m_helper.webView()->mainFrame(), url.string().utf8().data());
     }
 
     Page* page() const { return m_helper.webViewImpl()->page(); }
 
 private:
     FrameTestHelpers::WebViewHelper m_helper;
 };
 
 // Checks that the domain is set to the actual MHTML file, not the URL it was
 // generated from.
@@ skipping 11 matching lines @@
     Document* document = frame->document();
     ASSERT_TRUE(document);
 
     EXPECT_STREQ(kFileURL, frame->domWindow()->location().href().ascii().data());
 
     WebCore::SecurityOrigin* origin = document->securityOrigin();
     EXPECT_STRNE("localhost", origin->domain().ascii().data());
 }
 
 }