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

net/http2/hpack/decoder/hpack_varint_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_varint_decoder.h"
-
-#include <sstream>
-
-namespace net {
-
-std::string HpackVarintDecoder::DebugString() const {
-  std::stringstream ss;
-  ss << "HpackVarintDecoder(value=" << value_ << ", offset=" << offset_ << ")";
-  return ss.str();
-}
-
-DecodeStatus HpackVarintDecoder::StartForTest(uint8_t prefix_value,
-                                              uint8_t prefix_mask,
-                                              DecodeBuffer* db) {
-  return Start(prefix_value, prefix_mask, db);
-}
-
-DecodeStatus HpackVarintDecoder::StartExtendedForTest(uint8_t prefix_mask,
-                                                      DecodeBuffer* db) {
-  return StartExtended(prefix_mask, db);
-}
-
-DecodeStatus HpackVarintDecoder::ResumeForTest(DecodeBuffer* db) {
-  return Resume(db);
-}
-
-std::ostream& operator<<(std::ostream& out, const HpackVarintDecoder& v) {
-  return out << v.DebugString();
-}
-
-}  // namespace net