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With this change, if launched from shell as root, the uninstaller will:
* Not show any confirmation UX
* Not prompt for admin elevation

Also in this cl, cleanup some of the shared Mac constants by pushing
more into into constants_mac and fixing up the naming style. This
required minor updates to the prefpane and daemon controller.

BUG=None
TEST=None
Review URL: https://chromiumcodereview.appspot.com/10807061

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148442 0039d316-1c4b-4281-b951-d872f2087c98