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Also, conservatively assume that non-empty NRPT or unknown DnsConfig could mean
DirectAccess is used, and disable IPv6 probing in that case.

BUG=259792

Review URL: https://chromiumcodereview.appspot.com/23522036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223595 0039d316-1c4b-4281-b951-d872f2087c98