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

net/http2/decoder/payload_decoders/altsvc_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_ALTSVC_PAYLOAD_DECODER_H_
-#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_ALTSVC_PAYLOAD_DECODER_H_
-
-// Decodes the payload of a ALTSVC frame.
-
-#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 AltSvcPayloadDecoderPeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE AltSvcPayloadDecoder {
- public:
-  // States during decoding of a ALTSVC frame.
-  enum class PayloadState {
-    // Start decoding the fixed size structure at the start of an ALTSVC
-    // frame (Http2AltSvcFields).
-    kStartDecodingStruct,
-
-    // Handle the DecodeStatus returned from starting or resuming the
-    // decoding of Http2AltSvcFields. If complete, calls OnAltSvcStart.
-    kMaybeDecodedStruct,
-
-    // Reports the value of the strings (origin and value) of an ALTSVC frame
-    // to the listener.
-    kDecodingStrings,
-
-    // The initial decode buffer wasn't large enough for the Http2AltSvcFields,
-    // so this state resumes the decoding when ResumeDecodingPayload is called
-    // later with a new DecodeBuffer.
-    kResumeDecodingStruct,
-  };
-
-  // Starts the decoding of a ALTSVC 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 ALTSVC frame's payload that has been split across
-  // decode buffers.
-  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
-                                     DecodeBuffer* db);
-
- private:
-  friend class test::AltSvcPayloadDecoderPeer;
-
-  // Implements state kDecodingStrings.
-  DecodeStatus DecodeStrings(FrameDecoderState* state, DecodeBuffer* db);
-
-  Http2AltSvcFields altsvc_fields_;
-  PayloadState payload_state_;
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_ALTSVC_PAYLOAD_DECODER_H_