Remove usage of FOR_EACH_OBSERVER macro in ui/app_list

ui/app_list/views/app_list_view.cc

Index: ui/app_list/views/app_list_view.cc
diff --git a/ui/app_list/views/app_list_view.cc b/ui/app_list/views/app_list_view.cc
index beffb2960eec8e47154c27ffff64942358b4cc6b..893d005bc7e824f35954000a67ff7d4c783266e1 100644
--- a/ui/app_list/views/app_list_view.cc
+++ b/ui/app_list/views/app_list_view.cc
@@ -621,9 +621,10 @@ void AppListView::OnWidgetActivationChanged(views::Widget* widget,
                                             bool active) {
   // Do not called inherited function as the bubble delegate auto close
   // functionality is not used.
-  if (widget == GetWidget())
-    FOR_EACH_OBSERVER(AppListViewObserver, observers_,
-                      OnActivationChanged(widget, active));
+  if (widget == GetWidget()) {
+    for (auto& observer : observers_)
+      observer.OnActivationChanged(widget, active);
+  }
 }
 
 void AppListView::OnWidgetVisibilityChanged(views::Widget* widget,