void IAuthenticator.ClearAllCookies()
 {
     Android.Webkit.CookieManager cookieManager = Android.Webkit.CookieManager.Instance;
     cookieManager.RemoveAllCookie();
     cookieManager.Flush();
 }
 public WebkitCookieManagerProxy(Java.Net.ICookieStore store, ICookiePolicy policy)
     : base(null, policy)
 {
     this.webkitCookieManager = Android.Webkit.CookieManager.Instance;
 }