Open NaCl IRT file only once at startup

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 931f83ebead55d7ec2f98f36e1e62203d86254a5..0a64cd45049388e42d904545e07a60702e5beee0 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -50,6 +50,7 @@
 #include "chrome/browser/metrics/metrics_service.h"
 #include "chrome/browser/metrics/thread_watcher.h"
 #include "chrome/browser/metrics/tracking_synchronizer.h"
+#include "chrome/browser/nacl_host/nacl_process_host.h"
 #include "chrome/browser/net/chrome_dns_cert_provenance_checker.h"
 #include "chrome/browser/net/chrome_dns_cert_provenance_checker_factory.h"
 #include "chrome/browser/net/chrome_net_log.h"
@@ -1841,6 +1842,10 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
   // Start watching all browser threads for responsiveness.
   ThreadWatcherList::StartWatchingAll(parsed_command_line());
 
+#if !defined(DISABLE_NACL)
+  NaClProcessHost::EarlyStartup();
+#endif
+
   run_message_loop_ = true;
   return content::RESULT_CODE_NORMAL_EXIT;
 }