Loosen RFC 1738 compliance check to allow underscores where we already allowed hyphens, to match real-world needs.

I don't believe further loosening will be required but that data will hopefully be coming soon.  In the meantime people are asking for this fix.

BUG=25714
TEST=Entring "a_b.com" in the omnibox should default to navigate, not search
Review URL: http://codereview.chromium.org/339017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30245 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed