The advantage is that GURL's parsing of IPv6 addresses works on all systems, whereas getaddrinfo(ipv6_literal) only succeeds on IPv6 enabled systems.

This allows the tests to run consistently on all systems, including our own WinXP buildbots (which do not support IPv6).

BUG=http://crbug.com/16452
TEST=[net_unittests] SOCKS5ClientSocketTest.IPv6Domain, SOCKSClientSocketTest.SOCKS4AIfDomainInIPv6

Review URL: http://codereview.chromium.org/155618

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@21053 0039d316-1c4b-4281-b951-d872f2087c98