am 72ce4235: Merge "Fix possible race conditions during channel unregistration." into gingerbread

Merge commit '72ce42352c1c229e05d910b4176f3cddb608e814' into gingerbread-plus-aosp

* commit '72ce42352c1c229e05d910b4176f3cddb608e814':
  Fix possible race conditions during channel unregistration.