Prevent app bar title from drawing twice

Sometimes we could see a flick problem with app bar title. It appears to
draw the app bar title twice. This CL is to prevent app bar title from
rendering twice.

Bug: 182232144
Test: robotests and visual verified
1) Open Settings app
2) Click on any entrypoint
3) Observe and see if there's a flick problem on app bar title

Change-Id: I9f5b7cdd163f20dd7f85cf2f83b9ef01a473dd3c