Reviewed by Eric Seidel.

        Anonymous blocks need isRenderBlock cast check. Also, need
        to allow display BOX for flexible boxes.
        https://bugs.webkit.org/show_bug.cgi?id=56709

        Test: accessibility/anchor-linked-anonymous-block-crash.html

        * rendering/RenderBlock.cpp:
        (WebCore::canMergeContiguousAnonymousBlocks): remove specific
        fix in r81088 which is no longer needed.
        * rendering/RenderObject.h:
        (WebCore::RenderObject::isAnonymousBlock): Add isRenderBlock cast
        check.
2011-03-21  Abhishek Arya  <inferno@chromium.org>

        Reviewed by Eric Seidel.

        Tests that we do not crash when searching up the render tree
        for an anchor element in accessibility code.
        https://bugs.webkit.org/show_bug.cgi?id=56709

        * accessibility/anchor-linked-anonymous-block-crash-expected.txt: Added.
        * accessibility/anchor-linked-anonymous-block-crash.html: Added...