Remove findIPv4DefaultRoute am: 70770a8b57

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2727695

Change-Id: Iae61b837211082dda7be947bd550866417f7f6e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>