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

net/http2/decoder/payload_decoders/unknown_payload_decoder.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_PAYLOAD_DECODERS_UNKNOWN_PAYLOAD_DECODER_H_
-#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_UNKNOWN_PAYLOAD_DECODER_H_
-
-// Decodes the payload of a frame whose type unknown.  According to the HTTP/2
-// specification (http://httpwg.org/specs/rfc7540.html#FrameHeader):
-//     Implementations MUST ignore and discard any frame that has
-//     a type that is unknown.
-
-#include "net/base/net_export.h"
-#include "net/http2/decoder/decode_buffer.h"
-#include "net/http2/decoder/decode_status.h"
-#include "net/http2/decoder/frame_decoder_state.h"
-
-namespace net {
-
-class NET_EXPORT_PRIVATE UnknownPayloadDecoder {
- public:
-  // Starts decoding a payload of unknown type; just passes it to the listener.
-  DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db);
-
-  // Resumes decoding a payload of unknown type that has been split across
-  // decode buffers.
-  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
-                                     DecodeBuffer* db);
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_UNKNOWN_PAYLOAD_DECODER_H_