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The once-off creation logic is no longer needed as app
shortcuts have been enabled by default for a while.

This replaces kAppShortcutsHaveBeenCreated with
kAppShortcutsVersion and allows us to trigger a rebuild
of all app shortcuts. This is only implemented for Mac.

BUG=266725

Review URL: https://codereview.chromium.org/263403002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274498 0039d316-1c4b-4281-b951-d872f2087c98