Show an infobar when the user is using an unsupported flag.

chrome/browser/browser_init.h

Index: chrome/browser/browser_init.h
diff --git a/chrome/browser/browser_init.h b/chrome/browser/browser_init.h
index 9ac3a99a71b9be8b148b9ce997b81ab50800f1f1..4afa2c7ff82d6b18ce7e9033c032218113c033e1 100644
--- a/chrome/browser/browser_init.h
+++ b/chrome/browser/browser_init.h
@@ -115,6 +115,10 @@ class BrowserInit {
     // an infobar is added allowing the user to restore the last session.
     void AddCrashedInfoBarIfNecessary(TabContents* tab);
 
+    // If we have been started with unsupported flags like --single-process,
+    // politely nag the user about it.
+    void AddBadFlagsInfoBarIfNecessary(TabContents* tab);
+
     // Returns the list of URLs to open from the command line. The returned
     // vector is empty if the user didn't specify any URLs on the command line.
     std::vector<GURL> GetURLsFromCommandLine(Profile* profile);