I input byte stream [1,2,3,4,5], when i read `4` then remove  ByteToMessageDecoder,
 the out is stream [1,2,3,5,4]

Here are the test cases，the cases will fail

 @Test
    public void testDisorder(){
        ByteToMessageDecoder decoder = new ByteToMessageDecoder() {
            int count = 0;

            //read 4 byte then remove this decoder
            @Override
            protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {
                out.add(in.readBytes(1));
                if (++count >= 4) {
                    ctx.pipeline().remove(this);
                }
            }
        };

        EmbeddedChannel channel = new EmbeddedChannel(decoder);
        assertTrue(channel.writeInbound(Unpooled.wrappedBuffer(new byte[]{1, 2, 3, 4, 5})));
        assertEquals(1, ((ByteBuf) channel.readInbound()).readByte());
        assertEquals(2, ((ByteBuf) channel.readInbound()).readByte());
        assertEquals(3, ((ByteBuf) channel.readInbound()).readByte());
        assertEquals(4, ((ByteBuf) channel.readInbound()).readByte());
        assertEquals(5, ((ByteBuf) channel.readInbound()).readByte());
        assertFalse(channel.finish());
    }