Disable worker tests for debug builds.
Disable worker tests for debug builds.

BUG=17572
TEST=none
TBR=levin

Review URL: http://codereview.chromium.org/160029

git-svn-id: http://src.chromium.org/svn/trunk/src@21414 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 1cd631cf00bfb7d9d98472f75a7af5741c7bd1b3
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