Hide BaseFragmentActivity* from the API am: 5337818868 am: 5612544fc9
am: 7b95c1d17f  -s ours

* commit '7b95c1d17f07f7345677decbbd692091aae20859':
  Hide BaseFragmentActivity* from the API

Change-Id: Ie75227d58c96272a0d8009302bc6f84415dbb24e