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

net/http2/decoder/http2_structure_decoder_test_util.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_HTTP2_STRUCTURE_DECODER_TEST_UTIL_H_
-#define NET_HTTP2_DECODER_HTTP2_STRUCTURE_DECODER_TEST_UTIL_H_
-
-#include "net/http2/decoder/http2_structure_decoder.h"
-
-#include <cstddef>
-
-#include "net/http2/tools/http2_random.h"
-
-namespace net {
-namespace test {
-
-class Http2StructureDecoderPeer {
- public:
-  static void Randomize(Http2StructureDecoder* p, RandomBase* rng) {
-    p->offset_ = rng->Rand32();
-    for (size_t i = 0; i < sizeof p->buffer_; ++i) {
-      p->buffer_[i] = rng->Rand8();
-    }
-  }
-};
-
-}  // namespace test
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_HTTP2_STRUCTURE_DECODER_TEST_UTIL_H_