Add method for identifying different InfoBars

chrome/browser/infobars/insecure_content_infobar_delegate.cc

Index: chrome/browser/infobars/insecure_content_infobar_delegate.cc
diff --git a/chrome/browser/infobars/insecure_content_infobar_delegate.cc b/chrome/browser/infobars/insecure_content_infobar_delegate.cc
index eed7ecec55b4302b01a663f98e0697afe2689b6c..8af7856013e6450aa944f94203b3bb33bb7bae57 100644
--- a/chrome/browser/infobars/insecure_content_infobar_delegate.cc
+++ b/chrome/browser/infobars/insecure_content_infobar_delegate.cc
@@ -51,6 +51,11 @@ InsecureContentInfoBarDelegate::InsecureContentInfoBarDelegate()
 InsecureContentInfoBarDelegate::~InsecureContentInfoBarDelegate() {
 }
 
+infobars::InfoBarDelegate::InfoBarIdentifier
+InsecureContentInfoBarDelegate::GetIdentifier() const {
+  return INSECURE_CONTENT_INFOBAR_DELEGATE;
+}
+
 void InsecureContentInfoBarDelegate::InfoBarDismissed() {
   UMA_HISTOGRAM_ENUMERATION("InsecureContentInfoBarDelegateV2",
                             DISPLAY_INFOBAR_DISMISSED, NUM_EVENTS);