Reviewed by Darin Adler and Dan Bernstein.

        Assertion in updateStyleForAllDocuments.  Make sure to unscheduleStyleRecalc when an object goes into
        the page cache.  Disallow scheduling of style recalcs on a document that is already in the page cache.
        Schedule a style recalc if needed when an object comes out of the page cache.

        * dom/Document.cpp:
        (WebCore::Document::scheduleStyleRecalc):
        (WebCore::Document::setInPageCache):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@42439 268f45cc-cd09-0410-ab3c-d52691b4dbfc