tree a2d5f4103553694c4b73db324b4ca86de927b1a4
parent 715c72f8b9c45edc27fa2a4b0f3d5f2b0e0eefec
author William A. Kennington III <wak@google.com> 1531863614 -0700
committer William A. Kennington III <wak@google.com> 1531863614 -0700

source/base: Only disable the event if it exists

This shouldn't happen in practice but will be needed to supporting
moving.