Remove a secretive pre-launch warning from test_shell's startup page.
Remove a secretive pre-launch warning from test_shell's startup page.

file:// urls do not set a referer so this comment is not applicable.

Review URL: http://codereview.chromium.org/8180

git-svn-id: http://src.chromium.org/svn/trunk/src@3990 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 843a2c8766417ba40542265fb4fa728c9d582aad
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