Remove passing test from expected failures.
Remove passing test from expected failures.

BUG=15052
TEST=LayoutTests/transitions/repeated-firing-background-color.html
Review URL: http://codereview.chromium.org/150019

git-svn-id: http://src.chromium.org/svn/trunk/src@19486 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 56fe6aac68463dccd79a3a8628bc44be5dd306f8
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser