Add method for identifying different InfoBars

chrome/browser/android/fullscreen/fullscreen_infobar_delegate.cc

Index: chrome/browser/android/fullscreen/fullscreen_infobar_delegate.cc
diff --git a/chrome/browser/android/fullscreen/fullscreen_infobar_delegate.cc b/chrome/browser/android/fullscreen/fullscreen_infobar_delegate.cc
index 441e3f9d31fcfc20369e63e54d851e952d482c8a..ce53f35a2094f4cddfea652d06af7a4e49ebd790 100644
--- a/chrome/browser/android/fullscreen/fullscreen_infobar_delegate.cc
+++ b/chrome/browser/android/fullscreen/fullscreen_infobar_delegate.cc
@@ -60,6 +60,10 @@ void FullscreenInfoBarDelegate::CloseFullscreenInfoBar(
     infobar()->owner()->RemoveInfoBar(infobar());
 }
 
+std::string FullscreenInfoBarDelegate::GetIdentifier() const {
+  return "FullscreenInfoBarDelegate";
+}
+
 int FullscreenInfoBarDelegate::GetIconId() const {
   return IDR_ANDROID_INFOBAR_FULLSCREEN;
 }