- added RetainPtr, smart pointer for refcounted ObjC objects and CFTypes

        * WebCore.xcodeproj/project.pbxproj:
        * platform/cf/RetainPtr.h: Added.
        (WTF::):
        (WTF::RetainPtr::RetainPtr):
        (WTF::RetainPtr::~RetainPtr):
        (WTF::RetainPtr::get):
        (WTF::RetainPtr::operator*):
        (WTF::RetainPtr::operator->):
        (WTF::RetainPtr::operator!):
        (WTF::RetainPtr::operator UnspecifiedBoolType):
        (WTF::::operator):
        (WTF::::swap):
        (WTF::swap):
        (WTF::operator==):
        (WTF::operator!=):
        (WTF::static_pointer_cast):
        (WTF::const_pointer_cast):
        (WTF::getPtr):
        
        - use it in WidgetMac so it gets tested in at least one place
        
        * platform/mac/WidgetMac.mm:
        (WebCore::Widget::Widget):
        (WebCore::Widget::~Widget):
        (WebCore::Widget::setEnabled):
        (WebCore::Widget::isEnabled):
        (WebCore::Widget::setCursor):
        (WebCore::Widget::getView):
        (WebCore::Widget::setView):
        (WebCore::Widget::getOuterView):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16987 268f45cc-cd09-0410-ab3c-d52691b4dbfc