Add method for identifying different InfoBars

chrome/browser/plugins/plugin_infobar_delegates.h

Index: chrome/browser/plugins/plugin_infobar_delegates.h
diff --git a/chrome/browser/plugins/plugin_infobar_delegates.h b/chrome/browser/plugins/plugin_infobar_delegates.h
index d6a9488598e6aad1eaf2aabec6742c203efb360b..2b8846102f541542f8006880da11300f353c1d1f 100644
--- a/chrome/browser/plugins/plugin_infobar_delegates.h
+++ b/chrome/browser/plugins/plugin_infobar_delegates.h
@@ -48,6 +48,7 @@ class OutdatedPluginInfoBarDelegate : public ConfirmInfoBarDelegate,
   ~OutdatedPluginInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
   void InfoBarDismissed() override;
   int GetIconId() const override;
   base::string16 GetMessageText() const override;
@@ -102,6 +103,7 @@ class PluginMetroModeInfoBarDelegate : public ConfirmInfoBarDelegate {
   ~PluginMetroModeInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
   int GetIconId() const override;
   base::string16 GetMessageText() const override;
   int GetButtons() const override;