Allow hypen in domain name of email address for ChromeOS users UI.

Change '\w+' to [A-Za-z0-9]{2,63} in email address regexp. This allows
hypen to be used in domain name part of an email and sets a 2-63 chars
length limit.

Use the same email alias pattern for format3 as in format1 and format2.

BUG=chromium-os:10250
TEST=Verify fix for chromim-os:10250.

Review URL: http://codereview.chromium.org/5812004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69153 0039d316-1c4b-4281-b951-d872f2087c98