Reviewed by Darin Adler.

        <rdar://problem/6748609> Use ActiveDOMObject to suspend marquees
        
        Make marquees ActiveDOMObjects, get rid of the special suspension code.

        * html/HTMLMarqueeElement.cpp:
        (WebCore::HTMLMarqueeElement::HTMLMarqueeElement):
        (WebCore::HTMLMarqueeElement::canSuspend):
        (WebCore::HTMLMarqueeElement::suspend):
        (WebCore::HTMLMarqueeElement::resume):
        * html/HTMLMarqueeElement.h:
        * page/Frame.cpp:
        (WebCore::Frame::clearTimers):
        * rendering/RenderLayer.cpp:
        * rendering/RenderLayer.h:
        (WebCore::RenderLayer::marquee):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@42161 268f45cc-cd09-0410-ab3c-d52691b4dbfc