fix(Ast): Remove an import on quiver.
fix(Ast): Remove an import on quiver.

PiperOrigin-RevId: 192325313

chalin/angular2,angulardart/angular,matanlurey/angular,angulardart/angular,matanlurey/angular,chalin/angular2,angulardart/angular,chalin/angular2,matanlurey/angular