Merge "Remove unused codes that was used in setChildChain" am: fd6a2d7c8c

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2130594

Change-Id: Ib16c91f2674bfd05d572997cecf9412231298384
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>