[automerger skipped] Remove unused methods from NetworkManagementService. am:...

[automerger skipped] Remove unused methods from NetworkManagementService. am: b6a0decb am: 75dc828a am: e3a83ddb -s ours am: 3e5d6911 -s ours am: 75d1e82a -s ours

am skip reason: Merged-In Ib0d4e8c6a063ed57c5a790eab3868ed4fe9cf096 with SHA-1 03d91162 is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2608447



Change-Id: I6690bedafaa327468e15e9fabf2578cd6d38be56
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>