Revert "Unblock the registration of shortcut change callbacks"

This reverts commit efd686af335b918188167bdb185fc2aa7a40a9b5.

Reason for revert: Reverting as part of the https://b.corp.google.com/issues/345035133#comment19

Change-Id: If950e48fa1392dcafdd49a36e3f3f0d3df973669
1 file changed