Voicemail content provider APIs are now part of the SDK. This CL gets
rid of the local copy of VoicemailContracts and instead uses the APIs
from the SDK.
Key differences between the old and latest APIs
- voicemail permission renamed from READ_WRITE_OWN_VOICEMAILS to
ADD_VOICEMAIL
- voicemail state is a hidden field, so not part of the API. Demo app
should not use it.
- Use IS_READ field instead of NEW.
Change-Id: Ib142eb02bb89eed32a7976b66132893a98aba466
d407959ada