Remove dependencies on "Legacy" classes.

Prefactor to remove dependencies on "Legacy" classes in
PhoneNumberPickerFragment. PhoneNumberPickerFragment needs to be used
by Dialer but the Legacy class do not.  This change will allow
PhoneNumberPickerFragment to be moved into common without the other
legacy classes.

Bug: 6993891
Change-Id: I598c985f41188ab6ac65898f31236056be5007bf