Remove the fallback from SOCKSv4 to SOCKSv4a.

BUG=56836

Review URL: http://codereview.chromium.org/6719035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@79658 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed