[Code Health] Delete unused code. am: aa510cee am: ebbb9411 am: 51c27ec7...

[Code Health] Delete unused code. am: aa510cee am: ebbb9411 am: 51c27ec7 am: db1b0559 am: 8fb3b844 am: 1e5c9d2e am: ffe8007c

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2746873



Change-Id: Ic3be84dcf92b13413baf84eed4a9ec2434ddad8e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>