Use FileNetLogObserver for implementing --log-net-log.

chrome/browser/io_thread.cc

 // 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.
 
 #include "chrome/browser/io_thread.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 624 matching lines @@
   net::NetworkChangeNotifier::ShutdownHistogramWatcher();
 
   // This must be reset before the ChromeNetLog is destroyed.
   network_change_observer_.reset();
 
   system_proxy_config_service_.reset();
   delete globals_;
   globals_ = NULL;
 
   base::debug::LeakTracker<SystemURLRequestContextGetter>::CheckForLeaks();
+
+  if (net_log_)
+    net_log_->ShutdownBeforeTaskScheduler();
 }
 
 // static
 void IOThread::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterStringPref(prefs::kAuthSchemes,
                                "basic,digest,ntlm,negotiate");
   registry->RegisterBooleanPref(prefs::kDisableAuthNegotiateCnameLookup, false);
   registry->RegisterBooleanPref(prefs::kEnableAuthNegotiatePort, false);
   registry->RegisterStringPref(prefs::kAuthServerWhitelist, std::string());
   registry->RegisterStringPref(prefs::kAuthNegotiateDelegateWhitelist,
@@ skipping 243 matching lines @@
   if (command_line.HasSwitch(switches::kIgnoreUrlFetcherCertRequests))
     net::URLFetcher::SetIgnoreCertificateRequests(true);
 
   params->http_09_on_non_default_ports_enabled =
       http_09_on_non_default_ports_enabled;
 }
 
 metrics::UpdateUsagePrefCallbackType IOThread::GetMetricsDataUseForwarder() {
   return base::Bind(&UpdateMetricsUsagePrefsOnUIThread);
 }