Revert 38085 - A brief test of whether we can safely disable ipv6. Will rollback asap.
Revert 38085 - A brief test of whether we can safely disable ipv6. Will rollback asap.

Having had trouble with a probe based disabling of ipv6, I wanted
to understand if globally disabling IPv6 is problematic.

I'll rollback this chance as soon as the buildbots begin to test it.

tbr=wtc
Review URL: http://codereview.chromium.org/573004

TBR=jar@chromium.org
Review URL: http://codereview.chromium.org/561070

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@38086 0039d316-1c4b-4281-b951-d872f2087c98

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