ASSERTION FAILED: !remainder in WebCore::RenderTableSection::distributeExtraRowSpanHeightToAutoRows

While distributing the extra rowspan height in rows, result of multiplication
is overflowing in integer and whole method is getting failed due to this. So
typecasted a value to 'long long' and final result of the calculation always
fits in integer range.

BUG=334652
R=jchaffraix@chromium.org

Review URL: https://codereview.chromium.org/131103017

git-svn-id: svn://svn.chromium.org/blink/trunk@169843 bbb929c8-8fbe-4397-9dbb-9b2b20218538