suppress default chorme window on first login

chrome/browser/ui/startup/startup_browser_creator.cc

Index: chrome/browser/ui/startup/startup_browser_creator.cc
diff --git a/chrome/browser/ui/startup/startup_browser_creator.cc b/chrome/browser/ui/startup/startup_browser_creator.cc
index 46868e97ef7a38a22f7e055d368dd56170511f49..ccacf97f0449206c67ecb367d5ee35baa5801af0 100644
--- a/chrome/browser/ui/startup/startup_browser_creator.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator.cc
@@ -252,6 +252,11 @@ bool StartupBrowserCreator::LaunchBrowser(
     chrome::startup::IsProcessStartup process_startup,
     chrome::startup::IsFirstRun is_first_run,
     int* return_code) {
+
+  if (command_line.HasSwitch(switches::kSilentLaunch)) {
+    //return true;
+  }
+
   in_synchronous_profile_launch_ =
       process_startup == chrome::startup::IS_PROCESS_STARTUP;
   DCHECK(profile);