Add a test that verifies the DNS prefetching preference
Add a test that verifies the DNS prefetching preference

Review URL: http://codereview.chromium.org/2857018

git-svn-id: http://src.chromium.org/svn/trunk/src@53877 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e905d06b4b6856affd1703d04c2c971cc8cc1e02
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