Remove usages of ActionBarActivity.

ActionBarActivity has been deprecated for 2+ years and has been
extending AppCompatActivity for all that time. These changes
should be no-ops.

Bug: 35253513
Test: None
Change-Id: I969a612d4ae59d26369fea011608279423d30038
(cherry picked from commit 873172cf92d38b43122705b53f9c750246aa9e1b)