Remove replaced PreciseDataConnectionState methods from SDK.

Prior to finalization, we need to remove all methods which were
replaced but kept around for short-term compatibility purposes.
PreciseDataConnectionState had a couple methods that fell into this
category that had yet to be removed.

Bug: 152787887
Test: builds
Change-Id: Ib175b2530791cec7e31684a1d3f318c95e27f707