Update NetLog to be thread safe.

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
===================================================================
--- chrome/browser/browser_process_impl.cc	(revision 66783)
+++ chrome/browser/browser_process_impl.cc	(working copy)
@@ -34,6 +34,7 @@
 #include "chrome/browser/intranet_redirect_detector.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/metrics/metrics_service.h"
+#include "chrome/browser/net/chrome_net_log.h"
 #include "chrome/browser/net/predictor_api.h"
 #include "chrome/browser/net/sdch_dictionary_fetcher.h"
 #include "chrome/browser/net/sqlite_persistent_cookie_store.h"
@@ -113,6 +114,8 @@
   print_job_manager_.reset(new printing::PrintJobManager);
 
   shutdown_event_.reset(new base::WaitableEvent(true, false));
+
+  net_log_.reset(new ChromeNetLog);
 }
 
 BrowserProcessImpl::~BrowserProcessImpl() {
@@ -566,7 +569,7 @@
   background_x11_thread_.swap(background_x11_thread);
 #endif
 
-  scoped_ptr<IOThread> thread(new IOThread(local_state()));
+  scoped_ptr<IOThread> thread(new IOThread(local_state(), net_log_.get()));
   base::Thread::Options options;
   options.message_loop_type = MessageLoop::TYPE_IO;
   if (!thread->StartWithOptions(options))