Never show the default browser prompt over the first run promos

chrome/browser/first_run/first_run.h

Index: chrome/browser/first_run/first_run.h
diff --git a/chrome/browser/first_run/first_run.h b/chrome/browser/first_run/first_run.h
index d8abcf5ab49a163af7b56ef9aaf0ab0483b39680..001b33966a40a8427a5ef756b7bbebb58cab472f 100644
--- a/chrome/browser/first_run/first_run.h
+++ b/chrome/browser/first_run/first_run.h
@@ -20,6 +20,10 @@ class CommandLine;
 class FilePath;
 }
 
+namespace content {
+class WebContents;
+}
+
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
@@ -136,6 +140,9 @@ void SetShouldShowWelcomePage();
 // SetShouldShowWelcomePage() is called.
 bool ShouldShowWelcomePage();
 
+// Returns true if |contents| hosts one of the welcome pages.
+bool IsOnWelcomePage(content::WebContents* contents);
+
 // Iterates over the given tabs, replacing "magic words" designated for
 // use in Master Preferences files with corresponding URLs.
 std::vector<GURL> ProcessMasterPrefsTabs(const std::vector<GURL>& tabs);