Fix about:flags information not showing up in chrome://net-export/ logs

components/net_log/chrome_net_log.h

 // Copyright (c) 2012 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 COMPONENTS_NET_LOG_CHROME_NET_LOG_H_
 #define COMPONENTS_NET_LOG_CHROME_NET_LOG_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 12 matching lines @@
 }
 
 namespace net_log {
 
 class NetLogFileWriter;
 
 // ChromeNetLog is an implementation of NetLog that adds file loggers
 // as its observers.
 class ChromeNetLog : public net::NetLog {
  public:
+  // The parameters to the constructor are only used for command-line based
+  // NetLog writing (which starts immediately after construction).
+  //
+  // TODO(eroman): This would be clearer as a separate method to configure and
+  //               start this logging mode.
+  //
   // The log is saved to |log_file|.
   // |log_file_mode| is the mode used to log in |log_file|.
   // If |log_file| is empty, only a temporary log is created, and
   // |log_file_mode| is not used.
   ChromeNetLog(const base::FilePath& log_file,
                net::NetLogCaptureMode log_file_mode,
                const base::CommandLine::StringType& command_line_string,
                const std::string& channel_string);
   ~ChromeNetLog() override;
 
-  NetLogFileWriter* net_log_file_writer() { return net_log_file_writer_.get(); }
+  // TODO(eroman): Rename this to something clearer. Perhaps
+  //               |net_export_file_writer()|.
+  NetLogFileWriter* net_log_file_writer();
 
   // Returns a Value containing constants needed to load a log file.
   // Safe to call on any thread.
   static std::unique_ptr<base::Value> GetConstants(
       const base::CommandLine::StringType& command_line_string,
       const std::string& channel_string);
 
  private:
   std::unique_ptr<net::WriteToFileNetLogObserver> write_to_file_observer_;
   std::unique_ptr<NetLogFileWriter> net_log_file_writer_;
   std::unique_ptr<net::TraceNetLogObserver> trace_net_log_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeNetLog);
 };
 
 }  // namespace net_log
 
 #endif  // COMPONENTS_NET_LOG_CHROME_NET_LOG_H_