Revert "Add shims for NetworkRequest"

Revert submission 1626206-replaceUidRange

Reason for revert: Breaking build - b/183106405
Reverted Changes:
I0b79c73e8:Add shims for NetworkRequest
I4bc0daf5a:Replace the usage of UidRange
I4e5aec6ef:Replace the usage of UidRange
I107c329d4:Expose uids related APIs in NetworkRequest and Net...

Change-Id: I6290429db1c8e787f8138b55b98fd92a74ac6402