Defer af_throttled query to post-commit auto-commit mode

* Due to the nature of this code (a throttle) it will likely slam the DB,
  so push it after the end of the main transaction.

bug: 60600
Change-Id: I48895358deaa1b951d849eeee14c7126cfa25ec8
Merge "Defer af_throttled query to post-commit auto-commit mode"