Remove usage of FOR_EACH_OBSERVER macro in ash/

ash/display/screen_orientation_controller_chromeos.cc

Index: ash/display/screen_orientation_controller_chromeos.cc
diff --git a/ash/display/screen_orientation_controller_chromeos.cc b/ash/display/screen_orientation_controller_chromeos.cc
index 228143675e4fdddd30cd832dd8ab4500a10ac1b3..df403ae66f19b6da8269e90dfaf31cfc4673e3a2 100644
--- a/ash/display/screen_orientation_controller_chromeos.cc
+++ b/ash/display/screen_orientation_controller_chromeos.cc
@@ -132,8 +132,8 @@ void ScreenOrientationController::SetRotationLocked(bool rotation_locked) {
   rotation_locked_ = rotation_locked;
   if (!rotation_locked_)
     rotation_locked_orientation_ = blink::WebScreenOrientationLockAny;
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnRotationLockChanged(rotation_locked_));
+  for (auto& observer : observers_)
+    observer.OnRotationLockChanged(rotation_locked_);
   if (!display::Display::HasInternalDisplay())
     return;
   base::AutoReset<bool> auto_ignore_display_configuration_updates(