Reduce FOR_EACH_OBSERVER usage in extensions

extensions/components/native_app_window/native_app_window_views.cc

Index: extensions/components/native_app_window/native_app_window_views.cc
diff --git a/extensions/components/native_app_window/native_app_window_views.cc b/extensions/components/native_app_window/native_app_window_views.cc
index 902134211d5e65c39693b3a4b63e6ec2e43c4f32..f4abafac3c9ae2539b15b033ee1fbf5682effa73 100644
--- a/extensions/components/native_app_window/native_app_window_views.cc
+++ b/extensions/components/native_app_window/native_app_window_views.cc
@@ -194,9 +194,8 @@ void NativeAppWindowViews::RemoveObserver(
 }
 
 void NativeAppWindowViews::OnViewWasResized() {
-  FOR_EACH_OBSERVER(web_modal::ModalDialogHostObserver,
-                    observer_list_,
-                    OnPositionRequiresUpdate());
+  for (auto& observer : observer_list_)
+    observer.OnPositionRequiresUpdate();
 }
 
 // WidgetDelegate implementation.
@@ -272,9 +271,8 @@ bool NativeAppWindowViews::ShouldDescendIntoChildForEventHandling(
 // WidgetObserver implementation.
 
 void NativeAppWindowViews::OnWidgetDestroying(views::Widget* widget) {
-  FOR_EACH_OBSERVER(web_modal::ModalDialogHostObserver,
-                    observer_list_,
-                    OnHostDestroying());
+  for (auto& observer : observer_list_)
+    observer.OnHostDestroying();
 }
 
 void NativeAppWindowViews::OnWidgetVisibilityChanged(views::Widget* widget,