Revert^2 "Add shims for NetworkRequest"

b72b3ca7

The setUids method in NetworkRequest.Builder is updated to take
a set of integer Range instead of a set of UidRange. This causes
the existing cts net tests targeting for stable APIs failed.
Thus, create NetworkRequestShim as a wrapper that can be used in
common code.

Bug: 172183305
Test: m

Change-Id: Id1224690e29dd7655fa5ac33390491f34491eaa1
Merged-In: I0b79c73e82b6d0040cb3e5a822c40f62c329ce3f