DI merge injector signature

di_merge_injector_signature.ts

class Injector_ implements Injector {
  constructor(private view: ViewData, private elDef: NodeDef|null) {}
  get(token: any, notFoundValue: any = Injector.THROW_IF_NOT_FOUND): any {
    const allowPrivateServices =
        this.elDef ? (this.elDef.flags & NodeFlags.ComponentView) !== 0 : false;
    return Services.resolveDep(
        this.view, this.elDef, allowPrivateServices,
        {flags: DepFlags.None, token, tokenKey: tokenKey(token)}, notFoundValue);
  }
}