In RenderTableCell::paintCollapsedBorders() check surrounding cells using physical rather than logical direction
https://bugs.webkit.org/show_bug.cgi?id=120074

Reviewed by David Hyatt.

No new tests, covered by existing tests.

The functions cellAbove(), cellBelow() etc. check the logical rather than the physical direction but they're being
used to decide the painting of the physical borders of the cell. As we paint all four sides of every cell, and
the borders of adjoining cells twice over, this has no impact on painting currently but making the check consistent
in its treatment of physical and logical direction will help with webkit.org/b/119759 and make the code less confusing
to the next guy.

* rendering/RenderTableCell.cpp:
(WebCore::RenderTableCell::cellAtLeft):
(WebCore::RenderTableCell::cellAtRight):
(WebCore::RenderTableCell::cellAtTop):
(WebCore::RenderTableCell::cellAtBottom):
(WebCore::RenderTableCell::paintCollapsedBorders):
* rendering/RenderTableCell.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154389 268f45cc-cd09-0410-ab3c-d52691b4dbfc