Revert of headless: Add support for net logging

headless/lib/browser/headless_net_log.cc

-// 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.
-
-#include "headless/lib/browser/headless_net_log.h"
-
-#include <stdio.h>
-#include <utility>
-
-#include "base/command_line.h"
-#include "base/files/file_path.h"
-#include "base/files/scoped_file.h"
-#include "base/values.h"
-#include "build/build_config.h"
-#include "content/public/common/content_switches.h"
-#include "net/log/net_log_util.h"
-#include "net/log/write_to_file_net_log_observer.h"
-
-namespace headless {
-namespace {
-
-std::unique_ptr<base::Value> GetHeadlessConstants() {
-  std::unique_ptr<base::DictionaryValue> constants_dict =
-      net::GetNetConstants();
-
-  // Add a dictionary with client information
-  base::DictionaryValue* dict = new base::DictionaryValue();
-
-  dict->SetString("name", "headless");
-  dict->SetString(
-      "command_line",
-      base::CommandLine::ForCurrentProcess()->GetCommandLineString());
-
-  constants_dict->Set("clientInfo", dict);
-
-  return constants_dict;
-}
-
-}  // namespace
-
-HeadlessNetLog::HeadlessNetLog(const base::FilePath& log_path) {
-  // TODO(mmenke):  Other than a different set of constants, this code is
-  //     identical to code in ChromeNetLog.  Consider merging the code.
-
-  // Much like logging.h, bypass threading restrictions by using fopen
-  // directly.  Have to write on a thread that's shutdown to handle events on
-  // shutdown properly, and posting events to another thread as they occur
-  // would result in an unbounded buffer size, so not much can be gained by
-  // doing this on another thread.  It's only used when debugging, so
-  // performance is not a big concern.
-  base::ScopedFILE file;
-#if defined(OS_WIN)
-  file.reset(_wfopen(log_path.value().c_str(), L"w"));
-#elif defined(OS_POSIX)
-  file.reset(fopen(log_path.value().c_str(), "w"));
-#endif
-
-  if (!file) {
-    LOG(ERROR) << "Could not open file " << log_path.value()
-               << " for net logging";
-  } else {
-    std::unique_ptr<base::Value> constants(GetHeadlessConstants());
-    write_to_file_observer_.reset(new net::WriteToFileNetLogObserver());
-    write_to_file_observer_->StartObserving(this, std::move(file),
-                                            constants.get(), nullptr);
-  }
-}
-
-HeadlessNetLog::~HeadlessNetLog() {
-  // Remove the observer we own before we're destroyed.
-  if (write_to_file_observer_)
-    write_to_file_observer_->StopObserving(nullptr);
-}
-
-}  // namespace headless