Remove unused code

src/Shared/SharedTypeExtensions.cs

@@ -59,14 +59,6 @@ namespace System
                && !type.IsInterface
                && (!type.IsGenericType || !type.IsGenericTypeDefinition);
 
-        public static bool IsGrouping(this Type type) => IsGrouping(type.GetTypeInfo());
-
-        // TODO: Is this method ever actually called?
-        private static bool IsGrouping(TypeInfo type)
-                    => type.IsGenericType
-                       && (type.GetGenericTypeDefinition() == typeof(IGrouping<,>)
-                           || type.GetGenericTypeDefinition() == typeof(IAsyncGrouping<,>));
-
         public static Type UnwrapEnumType(this Type type)
         {
             var isNullable = type.IsNullableType();