Revert of headless: Add support for net logging

headless/lib/browser/headless_net_log.h

-// Copyright 2017 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 HEADLESS_LIB_BROWSER_HEADLESS_NET_LOG_H_
-#define HEADLESS_LIB_BROWSER_HEADLESS_NET_LOG_H_
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-#include "net/log/write_to_file_net_log_observer.h"
-
-namespace base {
-class FilePath;
-}
-
-namespace headless {
-
-class HeadlessNetLog : public net::NetLog {
- public:
-  explicit HeadlessNetLog(const base::FilePath& log_path);
-  ~HeadlessNetLog() override;
-
- private:
-  std::unique_ptr<net::WriteToFileNetLogObserver> write_to_file_observer_;
-
-  DISALLOW_COPY_AND_ASSIGN(HeadlessNetLog);
-};
-
-}  // namespace headless
-
-#endif  // HEADLESS_LIB_BROWSER_HEADLESS_NET_LOG_H_