[automerger skipped] Remove unused NetworkPolicyManagerInternal in CS am: 279b3381 am: f994ab19 am: 8cdbf889 -s ours am: e827d058 -s ours

am skip reason: skip tag Change-Id I8719ef2e96e7db9da2894b467b9e7a1bc09de386 with SHA-1 96ab9cfe is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1646969

Change-Id: I20ea8536c44b3b9955ef1ffec7c78c7ba10d329a