Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/ui/startup/obsolete_os_info_bar.h

Index: chrome/browser/ui/startup/obsolete_os_info_bar.h
===================================================================
--- chrome/browser/ui/startup/obsolete_os_info_bar.h	(revision 175396)
+++ chrome/browser/ui/startup/obsolete_os_info_bar.h	(working copy)
@@ -17,10 +17,8 @@
 // An infobar that is run with a string and a "Learn More" link.
 class ObsoleteOSInfoBar : public ConfirmInfoBarDelegate {
  public:
-  ObsoleteOSInfoBar(InfoBarService* infobar_service,
-                    const string16& message,
-                    const GURL& url);
-  virtual ~ObsoleteOSInfoBar();
+  // Creates an obsolete OS delegate and adds it to |infobar_service|.
+  static void Create(InfoBarService* infobar_service);
 
  private:
   virtual string16 GetMessageText() const OVERRIDE;
@@ -28,6 +26,11 @@
   virtual string16 GetLinkText() const OVERRIDE;
   virtual bool LinkClicked(WindowOpenDisposition disposition) OVERRIDE;
 
+  ObsoleteOSInfoBar(InfoBarService* infobar_service,
+                    const string16& message,
+                    const GURL& url);
+  virtual ~ObsoleteOSInfoBar();
+
   const string16 message_;
   const GURL learn_more_url_;