Revert of Add new HTTP/2 and HPACK decoder in net/http2/.

net/http2/decoder/decode_status.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef NET_HTTP2_DECODER_DECODE_STATUS_H_
-#define NET_HTTP2_DECODER_DECODE_STATUS_H_
-
-// Enum DecodeStatus is used to report the status of decoding of many
-// types of HTTP/2 and HPACK objects.
-
-#include <ostream>
-
-#include "net/base/net_export.h"
-
-namespace net {
-
-enum class DecodeStatus {
-  // Decoding is done.
-  kDecodeDone,
-
-  // Decoder needs more input to be able to make progress.
-  kDecodeInProgress,
-
-  // Decoding failed (e.g. HPACK variable length integer is too large, or
-  // an HTTP/2 frame has padding declared to be larger than the payload).
-  kDecodeError,
-};
-NET_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out, DecodeStatus v);
-
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_DECODE_STATUS_H_