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

net/http2/decoder/payload_decoders/ping_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_PING_PAYLOAD_DECODER_H_
-#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_PING_PAYLOAD_DECODER_H_
-
-// Decodes the payload of a PING frame; for the RFC, see:
-//     http://httpwg.org/specs/rfc7540.html#PING
-
-#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"
-#include "net/http2/http2_structures.h"
-
-namespace net {
-namespace test {
-class PingPayloadDecoderPeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE PingPayloadDecoder {
- public:
-  // Starts the decoding of a PING frame's payload, and completes it if the
-  // entire payload is in the provided decode buffer.
-  DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db);
-
-  // Resumes decoding a PING frame's payload that has been split across
-  // decode buffers.
-  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
-                                     DecodeBuffer* db);
-
- private:
-  friend class test::PingPayloadDecoderPeer;
-
-  DecodeStatus HandleStatus(FrameDecoderState* state, DecodeStatus status);
-
-  Http2PingFields ping_fields_;
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_PING_PAYLOAD_DECODER_H_