ApplicationDbContext trying out some overriding stuff

ApplicationDbContext.cs

using System.Data.Entity;
using System.Threading.Tasks;
using IoCIdentity.Models;
using Microsoft.AspNet.Identity.EntityFramework;


namespace IoCIdentity.Identity
{
    public class ApplicationDbContext : IdentityDbContext<ApplicationUser>, IApplicationDbContext
    {
        public ApplicationDbContext()
            : base("DefaultConnection", throwIfV1Schema: false)
        {
        }

        public override Task<int> SaveChangesAsync()
        {
            return base.SaveChangesAsync(); //no problems here
        }
    }

    public interface IApplicationDbContext
    {
        Task<int> SaveChangesAsync();
        //DbSet<Product> Products { get; set; }
    }

    public class SomeService
    {
        private readonly IApplicationDbContext dbContext;

        public SomeService(IApplicationDbContext dbContext)
        {
            this.dbContext = dbContext;
        }

        public async Task SomeAction()
        {
            var result = await dbContext.SaveChangesAsync();
        }
    }
}