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

net/http2/decoder/payload_decoders/data_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_DATA_PAYLOAD_DECODER_H_
-#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_DATA_PAYLOAD_DECODER_H_
-
-// Decodes the payload of a DATA 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"
-
-namespace net {
-namespace test {
-class DataPayloadDecoderPeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE DataPayloadDecoder {
- public:
-  // States during decoding of a DATA frame.
-  enum class PayloadState {
-    // The frame is padded and we need to read the PAD_LENGTH field (1 byte),
-    // and then call OnPadLength
-    kReadPadLength,
-
-    // Report the non-padding portion of the payload to the listener's
-    // OnDataPayload method.
-    kReadPayload,
-
-    // The decoder has finished with the non-padding portion of the payload,
-    // and is now ready to skip the trailing padding, if the frame has any.
-    kSkipPadding,
-  };
-
-  // Starts decoding a DATA 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 DATA frame's payload that has been split across
-  // decode buffers.
-  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
-                                     DecodeBuffer* db);
-
- private:
-  friend class test::DataPayloadDecoderPeer;
-
-  PayloadState payload_state_;
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_DATA_PAYLOAD_DECODER_H_