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Apparently, OS X allows commas as separators between hostnames in the hosts
file. Treat commas the same as whitespace to support this. (Hostnames and IP
addresses will never contain commas, so this shouldn't break anything.)

BUG=396309

Review URL: https://codereview.chromium.org/415153002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285718 0039d316-1c4b-4281-b951-d872f2087c98