Adds browser preferences to configure first-run flow on Windows 8.

chrome/browser/ui/startup/default_browser_prompt.cc

Index: chrome/browser/ui/startup/default_browser_prompt.cc
diff --git a/chrome/browser/ui/startup/default_browser_prompt.cc b/chrome/browser/ui/startup/default_browser_prompt.cc
index 39ae0d4183ab35192c172955f33bb2f3f14c33ad..dbdff89a386a66e94502318a6ea6487aecd081aa 100644
--- a/chrome/browser/ui/startup/default_browser_prompt.cc
+++ b/chrome/browser/ui/startup/default_browser_prompt.cc
@@ -178,13 +178,14 @@ void CheckDefaultBrowserCallback() {
 
 namespace chrome {
 
-void ShowDefaultBrowserPrompt(Profile* profile) {
+void ShowDefaultBrowserPrompt(Profile* profile,
+                              bool permit_prompt_on_first_run) {
   // We do not check if we are the default browser if:
   // - the user said "don't ask me again" on the infobar earlier.
   // - this is the first launch after the first run flow.
   // - There is a policy in control of this setting.
   if (!profile->GetPrefs()->GetBoolean(prefs::kCheckDefaultBrowser) ||
-      first_run::IsChromeFirstRun()) {
+      (first_run::IsChromeFirstRun() && !permit_prompt_on_first_run)) {
     return;
   }
   if (g_browser_process->local_state()->IsManagedPreference(