Add method for identifying different InfoBars

chrome/browser/infobars/insecure_content_infobar_delegate.h

 // Copyright (c) 2011 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_INFOBARS_INSECURE_CONTENT_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_INFOBARS_INSECURE_CONTENT_INFOBAR_DELEGATE_H_
 
 #include "components/infobars/core/confirm_infobar_delegate.h"
 
 class InfoBarService;
@@ skipping 12 matching lines @@
     DISPLAY_USER_OVERRIDE,      // User clicked allow anyway button.
     DISPLAY_USER_DID_NOT_LOAD,  // User clicked the don't load button.
     DISPLAY_INFOBAR_DISMISSED,  // User clicked close button.
     NUM_EVENTS
   };
 
   InsecureContentInfoBarDelegate();
   ~InsecureContentInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  std::string GetIdentifier() const override;
   void InfoBarDismissed() override;
   InsecureContentInfoBarDelegate* AsInsecureContentInfoBarDelegate() override;
   base::string16 GetMessageText() const override;
   base::string16 GetButtonLabel(InfoBarButton button) const override;
   bool Accept() override;
   bool Cancel() override;
   base::string16 GetLinkText() const override;
   GURL GetLinkURL() const override;
 
   DISALLOW_COPY_AND_ASSIGN(InsecureContentInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_INFOBARS_INSECURE_CONTENT_INFOBAR_DELEGATE_H_