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

components/net_log/chrome_net_log.cc

Index: components/net_log/chrome_net_log.cc
diff --git a/components/net_log/chrome_net_log.cc b/components/net_log/chrome_net_log.cc
index 5ec2e55a7c50744255247c0d1a3fb57a84521664..304b9929e6324acc50c30676e6ec68a9e8223d1d 100644
--- a/components/net_log/chrome_net_log.cc
+++ b/components/net_log/chrome_net_log.cc
@@ -29,8 +29,7 @@ ChromeNetLog::ChromeNetLog(
     net::NetLogCaptureMode log_file_mode,
     const base::CommandLine::StringType& command_line_string,
     const std::string& channel_string)
-    : net_log_file_writer_(
-          new NetLogFileWriter(this, command_line_string, channel_string)) {
+    : net_log_file_writer_(new NetLogFileWriter(this)) {
   if (!log_file.empty()) {
     // Much like logging.h, bypass threading restrictions by using fopen
     // directly.  Have to write on a thread that's shutdown to handle events on
@@ -73,6 +72,12 @@ ChromeNetLog::~ChromeNetLog() {
     trace_net_log_observer_->StopWatchForTraceStart();
 }
 
+NetLogFileWriter* ChromeNetLog::net_log_file_writer() {
+  if (!net_log_file_writer_)
+    net_log_file_writer_ = base::WrapUnique(new NetLogFileWriter(this));
+  return net_log_file_writer_.get();
+}
+
 // static
 std::unique_ptr<base::Value> ChromeNetLog::GetConstants(
     const base::CommandLine::StringType& command_line_string,