Remove StatsEvent.h/cpp and StatsEvent.aidl

As of ag/9820253, Binder communication between pull atom clients and
statsd uses the structured StatsEventParcel. The custom parcelable
StatsEvent class is not needed anymore.

Test: m
Change-Id: I33aa975a2cd1b02ba232aadc11e2ac58814de4c3
4 files changed