Add method for identifying different InfoBars

chrome/browser/ui/hung_plugin_tab_helper.cc

Index: chrome/browser/ui/hung_plugin_tab_helper.cc
diff --git a/chrome/browser/ui/hung_plugin_tab_helper.cc b/chrome/browser/ui/hung_plugin_tab_helper.cc
index 3da82e5846a04575d94b8b2754cdad4b54a24143..9fcb0205bc40912b76c16b7c78713e4469521b7c 100644
--- a/chrome/browser/ui/hung_plugin_tab_helper.cc
+++ b/chrome/browser/ui/hung_plugin_tab_helper.cc
@@ -147,6 +147,7 @@ class HungPluginInfoBarDelegate : public ConfirmInfoBarDelegate {
   ~HungPluginInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
+  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
   int GetIconId() const override;
   base::string16 GetMessageText() const override;
   int GetButtons() const override;
@@ -187,6 +188,11 @@ HungPluginInfoBarDelegate::HungPluginInfoBarDelegate(
 HungPluginInfoBarDelegate::~HungPluginInfoBarDelegate() {
 }
 
+infobars::InfoBarDelegate::InfoBarIdentifier
+HungPluginInfoBarDelegate::GetIdentifier() const {
+  return HUNG_PLUGIN_INFOBAR_DELEGATE_ID;
+}
+
 int HungPluginInfoBarDelegate::GetIconId() const {
   return IDR_INFOBAR_PLUGIN_CRASHED;
 }