QtWebkit: Fix compilaiton with clang.
    
    QObject::timerEvent is protected and cannot be accessed by QWebPagePrivate
    with clang
    
    QWebPagePrivate is a friend of QWebPage and then should have access to
    all protected members of parents of QWebPage, including QObject.
    But the clang team do not want to conform to this aspect of the specification
    because "It is either a drafting error or a horrible mistake."
    See http://llvm.org/bugs/show_bug.cgi?id=6840
    
    This change is better because QWebPage does not reimplement the timerEvent
    (QWebPagePrivate::timerEvent is called from QWebPage::event)
    So customers that would reimplement their own timerEvent
    for their own timer now get a chance to catch them.