TestScreen shouldn't be marked aura export

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index f734fb406277b84d10df9e2767e67e47cb49ce5a..ba83940f43dda1ba6d848da3a14bd7812fe993ed 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -37,7 +37,6 @@ class RootWindowHost;
 class RootWindowObserver;
 class KeyEvent;
 class MouseEvent;
-class ScreenAura;
 class StackingClient;
 class ScrollEvent;
 class TouchEvent;
@@ -73,7 +72,6 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   bool cursor_shown() const { return cursor_shown_; }
   Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
   Window* capture_window() { return capture_window_; }
-  const ScreenAura* screen() { return screen_; }
 
   // Shows the root window host.
   void ShowRootWindow();
@@ -82,9 +80,6 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   void SetHostSize(const gfx::Size& size);
   gfx::Size GetHostSize() const;
 
-  // Sets the screen's work area insets, this notifies observers too.
-  void SetScreenWorkAreaInsets(const gfx::Insets& insets);
-
   // Sets the currently-displayed cursor. If the cursor was previously hidden
   // via ShowCursor(false), it will remain hidden until ShowCursor(true) is
   // called, at which point the cursor that was last set via SetCursor() will be
@@ -313,8 +308,6 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
 
   ObserverList<RootWindowObserver> observers_;
 
-  ScreenAura* screen_;
-
   // The capture window. When not-null, this window receives all the mouse and
   // touch events.
   Window* capture_window_;