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A follow-up change will change gcapi to always install chrome
as current user (as determined by the CGSession owner), so that
chrome can set up user keystone itself on first run.

Also change the supported OS X versions from 10.5+ to 10.6-10.8.

BUG=128462

Review URL: https://chromiumcodereview.appspot.com/10854100

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151119 0039d316-1c4b-4281-b951-d872f2087c98