Remove unused code

src/Microsoft.AspNetCore.SignalR.Common/Internal/Formatters/MessageFormatUtils.cs

@@ -1,31 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System;
-using System.Binary.Base64;
-using System.Buffers;
-
-namespace Microsoft.AspNetCore.Sockets.Internal.Formatters
-{
-    internal static class MessageFormatUtils
-    {
-        public static byte[] DecodePayload(byte[] inputPayload)
-        {
-            if (inputPayload.Length > 0)
-            {
-                // Determine the output size
-                var decodedLength = Base64Decoder.ComputeDecodedLength(inputPayload);
-
-                // Allocate a new buffer to decode to
-                var decodeBuffer = new byte[decodedLength];
-                if (Base64.Decoder.Transform(inputPayload, decodeBuffer, out _, out var _) != TransformationStatus.Done)
-                {
-                    throw new FormatException("Invalid Base64 payload");
-                }
-                return decodeBuffer;
-            }
-
-            return inputPayload;
-        }
-    }
-}