Merge changes from topic "p_assisted_dialing_revert"

* changes:
  Revert "Add the core assisted dialing logic to telephony."
  Revert "Expose the assisted dialing setting activity to intents."
  Revert "Use the run script from external/robolectric-shadows"
  Revert "Add more unit tests for Assisted Dialing"
  Revert "Simplify some tests in AssistedDialingMediatorImplTest"