Fix for <rdar://problem/5228363> REGRESSION: In Mail, attempting to 
        create a To Do results in a crash

        This regressed with r21635. Now that -boundingBox updates layout if 
        it is needed, we infinitely recurse when Mail draws a custom 
        highlight. The fix is to put a guard around laying out the render 
        tree.

        * page/FrameView.cpp:
        (WebCore::FrameViewPrivate::reset):
        (WebCore::FrameView::layout):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21778 268f45cc-cd09-0410-ab3c-d52691b4dbfc