Reviewed by Darin Adler.

        ASSERT(oldchild->parent() == owner) fails.
        https://bugs.webkit.org/show_bug.cgi?id=50480

        In RenderBlock removeChild function, when the inlineChildrenBlock(equal to prev or next)
        is reparented to blockChildrenBlock, it is no longer a child of "this". This causes the
        assertion failure when removeChildNode executes on the child(equal to prev or next).
        Fix a typo in canMergeContiguousAnonymousBlocks.

        Test: fast/multicol/span/double-merge-anonymous-block-crash.html

        * rendering/RenderBlock.cpp:
        (WebCore::canMergeContiguousAnonymousBlocks): fix typo, change prev to next.
        (WebCore::RenderBlock::removeChild): if prev or not is reparented, then set it to zero.
2010-12-29  Abhishek Arya  <inferno@chromium.org>

        Reviewed by Darin Adler.

        Tests that we do not crash when merging anonymous blocks. 
        https://bugs.webkit.org/show_bug.cgi?id=50480

        * fast/multicol/span/double-merge-anonymous-block-crash-expected.txt: Added.
        * fast/multicol/span/double-merge-anonymous-block-crash.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@74781 268f45cc-cd09-0410-ab3c-d52691b4dbfc