bfac31b517
- Add account preference controller and move the handling for displaying user's accounts from AccountSettings to the controller. - Move AccountPreference and RemoveUserFragment from inner class to standalone class. - Add AccountRestrictionHelper to handle API that needs to be mocked for testing. Bug: 31801423 Test: make RunSettingsRoboTests Change-Id: I3d16d0b6a8922a8abec7037c52b7a4de2d76eb0d