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We've deprecated the proxyservice user in favor of the tlsdate
user tlsdated runs as. Add this user to the ACL for LibCrosService
so that we can delete the old one.

BUG=chromium:376526
TEST=tlsdated autotests

Review URL: https://codereview.chromium.org/299063002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272470 0039d316-1c4b-4281-b951-d872f2087c98