[CSS Regions] Convert a fast/regions pixel test to a ref test

[CSS Regions] Convert a fast/regions pixel test to a ref test
https://bugs.webkit.org/show_bug.cgi?id=83713

Patch by David Alcala <dalcala@adobe.com> on 2012-04-12
Reviewed by Dirk Schulze.

* fast/regions/region-overflow-break-expected.html: Added.
* platform/chromium-mac-snowleopard/fast/regions/region-overflow-break-expected.png: Removed.
* platform/chromium-mac-snowleopard/fast/regions/region-overflow-break-expected.txt: Removed.
* platform/efl/fast/regions/region-overflow-break-expected.png: Removed.
* platform/efl/fast/regions/region-overflow-break-expected.txt: Removed.
* platform/mac-snowleopard/fast/regions/region-overflow-break-expected.png: Removed.
* platform/mac-snowleopard/fast/regions/region-overflow-break-expected.txt: Removed.
* platform/mac/fast/regions/region-overflow-break-expected.txt: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113998 268f45cc-cd09-0410-ab3c-d52691b4dbfc