Disable caching of failed DNS lookups.
Disable caching of failed DNS lookups.

This is causing problems on network changes, since we don't have a reliable signal for telling when DNS is back up (so we aren't able to flush the cache properly).

This will regress bug 1672, filed 46821 to address that.

BUG=46821

Review URL: http://codereview.chromium.org/2873003

git-svn-id: http://src.chromium.org/svn/trunk/src@50141 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7beab28c3a32b634ac7856400bf3f742422d4898
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