[CSSRegions] Fix broken paths in some regions tests
https://bugs.webkit.org/show_bug.cgi?id=130012

Reviewed by Andrei Bucur.

* fast/regions/cssom/offsetLeft-offsetTop-in-multiple-regions.html:
* fast/regions/region-styling/region-style-image-background-color-expected.html:
* fast/regions/region-styling/region-style-image-background-color.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@165372 268f45cc-cd09-0410-ab3c-d52691b4dbfc