Remove unnecessary proguard flags

These are now exported from these libraries automatically.

Test: m Contacts; classes-proguard.jar has same contents
Change-Id: If215736e062f9ddaf0fcd63aa9b856bc25e34945
Merged-In: If215736e062f9ddaf0fcd63aa9b856bc25e34945
(cherry picked from commit 476d2cb726728636c91314fd795c5365e344dfaa)
1 file changed