Add method for identifying different InfoBars

chrome/browser/ui/extensions/extension_install_ui_default.cc

Index: chrome/browser/ui/extensions/extension_install_ui_default.cc
diff --git a/chrome/browser/ui/extensions/extension_install_ui_default.cc b/chrome/browser/ui/extensions/extension_install_ui_default.cc
index 93071d4e9ac2206a65e880b0761550b678d50dba..8a470fe1228522e7f133797015eab6e7277c474e 100644
--- a/chrome/browser/ui/extensions/extension_install_ui_default.cc
+++ b/chrome/browser/ui/extensions/extension_install_ui_default.cc
@@ -84,6 +84,7 @@ class ErrorInfoBarDelegate : public ConfirmInfoBarDelegate {
   ~ErrorInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  std::string GetIdentifier() const override;
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
   base::string16 GetLinkText() const override;
@@ -109,6 +110,10 @@ ErrorInfoBarDelegate::ErrorInfoBarDelegate(
 ErrorInfoBarDelegate::~ErrorInfoBarDelegate() {
 }
 
+std::string ErrorInfoBarDelegate::GetIdentifier() const {
+  return "ErrorInfoBarDelegate";
+}
+
 base::string16 ErrorInfoBarDelegate::GetMessageText() const {
   return error_.message();
 }