Add method for identifying different InfoBars

chrome/browser/plugins/chrome_plugin_service_filter.cc

Index: chrome/browser/plugins/chrome_plugin_service_filter.cc
diff --git a/chrome/browser/plugins/chrome_plugin_service_filter.cc b/chrome/browser/plugins/chrome_plugin_service_filter.cc
index 34070015a4c2185381c07278f10f9294e3c81b5f..ada2124e556bb91ca40e0776f4c004452be892b0 100644
--- a/chrome/browser/plugins/chrome_plugin_service_filter.cc
+++ b/chrome/browser/plugins/chrome_plugin_service_filter.cc
@@ -76,6 +76,7 @@ class NPAPIRemovalInfoBarDelegate : public ConfirmInfoBarDelegate {
   ~NPAPIRemovalInfoBarDelegate() override;
 
   // ConfirmInfobarDelegate:
+  std::string GetIdentifier() const override;
   int GetIconId() const override;
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
@@ -150,6 +151,10 @@ NPAPIRemovalInfoBarDelegate::NPAPIRemovalInfoBarDelegate(
 NPAPIRemovalInfoBarDelegate::~NPAPIRemovalInfoBarDelegate() {
 }
 
+std::string NPAPIRemovalInfoBarDelegate::GetIdentifier() const {
+  return "NPAPIRemovalInfoBarDelegate";
+}
+
 int NPAPIRemovalInfoBarDelegate::GetIconId() const {
   return IDR_INFOBAR_WARNING;
 }