DO NOT MERGE: Remove SMS shortcode warning feature.

Fix jb-dev build. The SMS shortcode warning feature has some usability
limitations which need to be resolved before shipping. Remove the code
for JellyBean. It will be added back to a future release when the
feature is complete.

Bug: 6605549
Change-Id: Ic8a68dc0b1ad038618962185f5ee680d5281ca21