Make ART fail gracefully when it can't update the desired code.

ART was exiting with a fatal error when it couldn't clean an obsolete
file. Relaxing this and failing gracefully preserves the behaviour that
Dalvik had.

Bug: 15313272

(cherry picked from commit c54aea7f4acd1a32bb298d43c20e3e0217638926)

Change-Id: I862a8925a0edd6370e94af8fa984a64099240029
2 files changed