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Using dirtyLinesFromChangedChild() was the wrong choice in
https://codereview.chromium.org/1167543008 as it can dirty the
lineboxes of descendants and ancestors. We're only interested
in dirtying the lineboxes of the current parent as it is
only to one of them we will possibly attach the float.

I have more to do here to understand why I'm not getting a
height on the span in my new test, but this successfully
addresses the assert in bug 510703 and seems obviously more
correct than what I currently have.


BUG=510703

Review URL: https://codereview.chromium.org/1308433003

git-svn-id: svn://svn.chromium.org/blink/trunk@201025 bbb929c8-8fbe-4397-9dbb-9b2b20218538