Hide the main window when Set-As-Default dialog is present.

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 84a6a510644adb096528bc9aec9626c23a70a138..9c3ab698005b92cd90661e4db7676ffb34998b87 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -1131,10 +1131,12 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
     chrome::SetNewHomePagePrefs(profile_->GetPrefs());
     browser_process_->profile_manager()->OnImportFinished(profile_);
 
-    if (!master_prefs_->suppress_first_run_default_browser_prompt)
-      chrome::ShowFirstRunDefaultBrowserPrompt(profile_);
-    else
+    if (!master_prefs_->suppress_first_run_default_browser_prompt) {
+      browser_creator_->set_show_main_browser_window(
+          !chrome::ShowFirstRunDefaultBrowserPrompt(profile_));
+    } else {
       browser_creator_->set_is_default_browser_dialog_suppressed(true);
+    }
   }  // if (is_first_run_)
 
 #if defined(OS_WIN)