Revert "Fix Whisperpush and Voice+ when using the new Hangouts."

This reverts commit ee060f8de3723c679bcf9dd7bfdfce2348f47c33.
Revert "Voice+, Whisperpush: Need to send SMS_RECEIVED_ACTION for all apps."

This reverts commit b20d9c3c53a90f82f01097d98dc33fd49a9e960d.
Revert "telephony: add SyntheticSmsMessage class"

This reverts commit 682fb2a1668a468fc1a1a909e86389b2a3842d59.
Revert "SMSDispatcher: Fix determining the defaultSmsApp for proxied messages"

This reverts commit af61cf355e7cf5f1709de9d0034918b9d8402375.
Revert "Add SMS Middleware layer."

This reverts commit 32c77559b676187a87f4d4edca541dcb474535e0.