Modified VoicemailContentProvider to set 'SELF_CHANGE' in notifications.

VoicemailContentProvider now sets the new boolean extra 'SELF_CHANGE'
instead of 'CHANGED_BY' in its broadcast intents. This is more secure as
we do not reveal the details of the application that caused the change.

see bug https://b/4773134

Change-Id: I9ff1c782d9924da628b00cd9e712ab3dba9ab9d2
1 file changed