Remove usage of FOR_EACH_OBSERVER macro in chromecast

chromecast/graphics/cast_vsync_settings.cc

Index: chromecast/graphics/cast_vsync_settings.cc
diff --git a/chromecast/graphics/cast_vsync_settings.cc b/chromecast/graphics/cast_vsync_settings.cc
index 5c2a9517946b49efc7008b4b3ed7c2d1016ae600..dd908a5807173f93eec3744f42d3cf327374f4f9 100644
--- a/chromecast/graphics/cast_vsync_settings.cc
+++ b/chromecast/graphics/cast_vsync_settings.cc
@@ -22,8 +22,8 @@ void CastVSyncSettings::SetVSyncInterval(base::TimeDelta interval) {
   if (interval_ == interval)
     return;
   interval_ = interval;
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnVSyncIntervalChanged(interval));
+  for (auto& observer : observers_)
+    observer.OnVSyncIntervalChanged(interval);
 }
 
 void CastVSyncSettings::AddObserver(Observer* observer) {