[CSS Exclusions] shape-inside, shape-padding, polygon test failing when subpixel layout is disabled
https://bugs.webkit.org/show_bug.cgi?id=115649

Reviewed by Dirk Schulze.

Another correction of a padded shape test that failed when subpixel layout was disabled.
This test puts a cross pattern made of five Ahem characters on three lines, within a padded
diamond polygon. The left edges of each line depend on the intersection of the padded polygon's
edges with the top of each line, which makes predicting the exact values unreliable. So we
just verify that the left edges of each line are within a pixel of the ideal value. This
change is very similar to the one made for bug 115490.

* fast/exclusions/shape-inside/shape-inside-polygon-padding-002-expected.html: Removed.
* fast/exclusions/shape-inside/shape-inside-polygon-padding-002-expected.txt: Added.
* fast/exclusions/shape-inside/shape-inside-polygon-padding-002.html:
* platform/mac/TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149699 268f45cc-cd09-0410-ab3c-d52691b4dbfc