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: de016e52bd170d2d4f2344f9bf92d50478b649e0@50141 0039d316-1c4b-4281-b951-d872f2087c98

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