Add method for identifying different InfoBars

chrome/browser/ui/startup/obsolete_system_infobar_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 #include "url/gurl.h"
 
 class InfoBarService;
 
 // An infobar that displays a message saying the system (OS or hardware) is
 // obsolete, along with a "Learn More" link.
 class ObsoleteSystemInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
   // Creates an obsolete system infobar and delegate and adds the infobar to
   // |infobar_service|.
   static void Create(InfoBarService* infobar_service);
 
  private:
   ObsoleteSystemInfoBarDelegate();
   ~ObsoleteSystemInfoBarDelegate() override;
 
+  std::string GetIdentifier() const override;
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
   base::string16 GetLinkText() const override;
   GURL GetLinkURL() const override;
 
   DISALLOW_COPY_AND_ASSIGN(ObsoleteSystemInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_STARTUP_OBSOLETE_SYSTEM_INFOBAR_DELEGATE_H_