Revert "Reland "libutils: disable implicit ref base construction""

This reverts commit 02c47655e7d3a5a2dfaf78a5dd225f5727ff8fa4.

Reason for revert: broke another test b/186468053

Change-Id: I0ec82455ad203071e523092ae3cb5f0f1df6aac7
5 files changed