Do not persist and restore the media button event receiver

Do not persist the media button event receiver.
Do not restore the media button event receiver on behalf of the
  application that registered. Prevents reported vulnerability.

Bug 15428797

Change-Id: I7ca3e7fccb165c55b23f471c00e0ed77436f7dc1
(cherry picked from commit e90905ada5133f84e661a0ec00becc4d529a6a2a)