Add method for identifying different InfoBars

chrome/browser/ui/startup/obsolete_system_infobar_delegate.cc

Index: chrome/browser/ui/startup/obsolete_system_infobar_delegate.cc
diff --git a/chrome/browser/ui/startup/obsolete_system_infobar_delegate.cc b/chrome/browser/ui/startup/obsolete_system_infobar_delegate.cc
index 1166b2bccee74be67cc369d84bb326a4e7f11495..9d8dee64d680617b44f407df28eeba67075c1d97 100644
--- a/chrome/browser/ui/startup/obsolete_system_infobar_delegate.cc
+++ b/chrome/browser/ui/startup/obsolete_system_infobar_delegate.cc
@@ -28,6 +28,11 @@ ObsoleteSystemInfoBarDelegate::ObsoleteSystemInfoBarDelegate()
 ObsoleteSystemInfoBarDelegate::~ObsoleteSystemInfoBarDelegate() {
 }
 
+infobars::InfoBarDelegate::InfoBarIdentifier
+ObsoleteSystemInfoBarDelegate::GetIdentifier() const {
+  return OBSOLETE_SYSTEM_INFOBAR_DELEGATE_ID;
+}
+
 base::string16 ObsoleteSystemInfoBarDelegate::GetMessageText() const {
   return ObsoleteSystem::LocalizedObsoleteString();
 }