Remove the system menu display settings row

ash/shell.h

Index: ash/shell.h
diff --git a/ash/shell.h b/ash/shell.h
index 542d572504ce771ed2dc091d20643c81e6666360..a120361be84364b512a26ade67d4772a60aaa8e9 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -128,6 +128,7 @@ class SystemTray;
 class ToplevelWindowEventHandler;
 class TouchTransformerController;
 class TouchObserverHUD;
+class ScreenLayoutObserver;
 class UserWallpaperDelegate;
 class VirtualKeyboardController;
 class VideoActivityNotifier;
@@ -596,6 +597,7 @@ class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
 
   // Implements content::ScreenOrientationController for ChromeOS
   std::unique_ptr<ScreenOrientationController> screen_orientation_controller_;
+  std::unique_ptr<ScreenLayoutObserver> screen_layout_observer_;
 
   std::unique_ptr<TouchTransformerController> touch_transformer_controller_;