[DO NOT MERGE] Revert submission 9950791-pick-precise-dataconn

Reason for revert: Droidcop-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_qt-qpr1-dev-plus-aosp&target=aosp_cf_x86_phone-userdebug&lkgb=6087936&lkbb=6087980&fkbb=6087980, b/146588413
Reverted Changes:
I8445808a0: Expose PreciseDataConnectionState to Public API
Ib6a769f5a: Expose PreciseDataConnectionState to Public API

Note: These CLs are correctly applied in master already.
      The revert should merge to qt-qpr1-dev-plus-aosp only
Change-Id: If98f8ba5f20073bade40f7b167ed185c2e4c0e1b