Reviewed by Sam Weinig.

        - fix assertion failure in RenderBlock::determineStartPosition() at http://www.wired.com/techbiz/it/magazine/16-04/bz_apple

        Test: fast/repaint/line-flow-with-floats-10.html

        * rendering/bidi.cpp:
        (WebCore::RenderBlock::determineStartPosition): Removed bogus assertion.
        If the float's top margin has changed and it has not been repositioned
        yet, we do not have its new y position.

LayoutTests:

        Reviewed by Sam Weinig.

        - test for assertion failure in RenderBlock::determineStartPosition() at http://www.wired.com/techbiz/it/magazine/16-04/bz_apple

        * fast/repaint/line-flow-with-floats-10.html: Added.
        * platform/mac/fast/repaint/line-flow-with-floats-10-expected.checksum: Added.
        * platform/mac/fast/repaint/line-flow-with-floats-10-expected.png: Added.
        * platform/mac/fast/repaint/line-flow-with-floats-10-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31157 268f45cc-cd09-0410-ab3c-d52691b4dbfc