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

net/http2/decoder/payload_decoders/settings_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_SETTINGS_PAYLOAD_DECODER_H_
-#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_SETTINGS_PAYLOAD_DECODER_H_
-
-// Decodes the payload of a SETTINGS frame; for the RFC, see:
-//     http://httpwg.org/specs/rfc7540.html#SETTINGS
-
-#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 SettingsPayloadDecoderPeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE SettingsPayloadDecoder {
- public:
-  // Starts the decoding of a SETTINGS 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 SETTINGS frame that has been split across decode
-  // buffers.
-  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
-                                     DecodeBuffer* db);
-
- private:
-  friend class test::SettingsPayloadDecoderPeer;
-
-  // Decodes as many settings as are available in the decode buffer, starting at
-  // the first byte of one setting; if a single setting is split across buffers,
-  // ResumeDecodingPayload will handle starting from where the previous call
-  // left off, and then will call StartDecodingSettings.
-  DecodeStatus StartDecodingSettings(FrameDecoderState* state,
-                                     DecodeBuffer* db);
-
-  // Decoding a single SETTING returned a status other than kDecodeDone; this
-  // method just brings together the DCHECKs to reduce duplication.
-  DecodeStatus HandleNotDone(FrameDecoderState* state,
-                             DecodeBuffer* db,
-                             DecodeStatus status);
-
-  Http2SettingFields setting_fields_;
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_SETTINGS_PAYLOAD_DECODER_H_