Add tlsdate user to LibCrosService DBus ACL

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

chrome/browser/chromeos/dbus/org.chromium.LibCrosService.conf

@@ -20,6 +20,10 @@
   </policy>
 
   <!-- tlsdate needs to query proxy config. -->
+  <policy user="tlsdate">
+    <allow send_destination="org.chromium.LibCrosService"/>
+  </policy>
+  <!-- TODO(cmasone): proxystate user is deprecated. crbug.com/376526 -->
   <policy user="proxystate">
     <allow send_destination="org.chromium.LibCrosService"/>
   </policy>