Disable a test that fails on mac.  I enabled this in r14684, but it's not ready yet for mac.
Disable a test that fails on mac.  I enabled this in r14684, but
it's not ready yet for mac.

TBR=evan

Review URL: http://codereview.chromium.org/100083


git-svn-id: http://src.chromium.org/svn/trunk/src@14686 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 3c35884e7fdaae9a184b8c42966f96452e283547
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