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

net/http2/hpack/decoder/hpack_block_decoder.cc

-// 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.
-
-#include "net/http2/hpack/decoder/hpack_block_decoder.h"
-
-#include <stdint.h>
-
-#include <sstream>
-#include <string>
-
-#include "base/logging.h"
-
-namespace net {
-
-DecodeStatus HpackBlockDecoder::Decode(DecodeBuffer* db) {
-  if (!before_entry_) {
-    DVLOG(2) << "HpackBlockDecoder::Decode resume entry, db->Remaining="
-             << db->Remaining();
-    DecodeStatus status = entry_decoder_.Resume(db, listener_);
-    switch (status) {
-      case DecodeStatus::kDecodeDone:
-        before_entry_ = true;
-        break;
-      case DecodeStatus::kDecodeInProgress:
-        DCHECK_EQ(0u, db->Remaining());
-        return DecodeStatus::kDecodeInProgress;
-      case DecodeStatus::kDecodeError:
-        return DecodeStatus::kDecodeError;
-    }
-  }
-  DCHECK(before_entry_);
-  while (db->HasData()) {
-    DVLOG(2) << "HpackBlockDecoder::Decode start entry, db->Remaining="
-             << db->Remaining();
-    DecodeStatus status = entry_decoder_.Start(db, listener_);
-    switch (status) {
-      case DecodeStatus::kDecodeDone:
-        continue;
-      case DecodeStatus::kDecodeInProgress:
-        DCHECK_EQ(0u, db->Remaining());
-        before_entry_ = false;
-        return DecodeStatus::kDecodeInProgress;
-      case DecodeStatus::kDecodeError:
-        return DecodeStatus::kDecodeError;
-    }
-    DCHECK(false);
-  }
-  DCHECK(before_entry_);
-  return DecodeStatus::kDecodeDone;
-}
-
-std::string HpackBlockDecoder::DebugString() const {
-  std::stringstream ss;
-  ss << "HpackBlockDecoder(" << entry_decoder_.DebugString() << ", listener@"
-     << std::hex << reinterpret_cast<intptr_t>(listener_)
-     << (before_entry_ ? ", between entries)" : ", in an entry)");
-  return ss.str();
-}
-
-std::ostream& operator<<(std::ostream& out, const HpackBlockDecoder& v) {
-  return out << v.DebugString();
-}
-
-}  // namespace net