Reduce usage of FOR_EACH_OBSERVER macro in components/

components/omnibox/browser/omnibox_popup_model.cc

Index: components/omnibox/browser/omnibox_popup_model.cc
diff --git a/components/omnibox/browser/omnibox_popup_model.cc b/components/omnibox/browser/omnibox_popup_model.cc
index e8f1d92faafde7c6afb934ee3351bf0a564bdd1b..6fa120ea775bdbb75d6b7e213480eedb931b4f26 100644
--- a/components/omnibox/browser/omnibox_popup_model.cc
+++ b/components/omnibox/browser/omnibox_popup_model.cc
@@ -284,8 +284,8 @@ void OmniboxPopupModel::OnResultChanged() {
   view_->UpdatePopupAppearance();
   // If popup has just been shown or hidden, notify observers.
   if (view_->IsOpen() != popup_was_open) {
-    FOR_EACH_OBSERVER(OmniboxPopupModelObserver, observers_,
-                      OnOmniboxPopupShownOrHidden());
+    for (OmniboxPopupModelObserver& observer : observers_)
+      observer.OnOmniboxPopupShownOrHidden();
   }
 }