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        Reviewed by Kenneth Rohde Christiansen.

        [Qt][WK2] Loading an empty URL crashes
        https://bugs.webkit.org/show_bug.cgi?id=55501

        A null WKURLRef is created in the API of WebKit 2 when converting a null string. The code
        of WKPageLoadURL assume the WKPageRef is not null which causes crashes if it is.

        This patch uses the converter toWTFString() to pass from WKPageRef to WTFString. This converter
        ensure the returned string is a valid null string.

        Tested through the Qt API tests.

        * UIProcess/API/C/WKPage.cpp:
        (WKPageLoadURL):
        * UIProcess/API/qt/tests/qgraphicswkview/tst_qgraphicswkview.cpp:
        (tst_QGraphicsWKView::loadEmptyUrl):
        * UIProcess/API/qt/tests/qwkpage/qwkpage.pro: Added.
        * UIProcess/API/qt/tests/qwkpage/tst_qwkpage.cpp: Added.
        (tst_QWKPage::init):
        (tst_QWKPage::cleanup):
        (tst_QWKPage::loadEmptyUrl):
        * UIProcess/API/qt/tests/tests.pro:

git-svn-id: svn://svn.chromium.org/blink/trunk@81237 bbb929c8-8fbe-4397-9dbb-9b2b20218538