Rename gfx::Display/Screen to display::Display/Screen in ash

ash/display/screen_position_controller.h

Index: ash/display/screen_position_controller.h
diff --git a/ash/display/screen_position_controller.h b/ash/display/screen_position_controller.h
index c87d82d494ba33e7e0d4220cc059bd0351459aef..5ea9d8c8e4da3c494221ca83cae6ccea59496e17 100644
--- a/ash/display/screen_position_controller.h
+++ b/ash/display/screen_position_controller.h
@@ -38,7 +38,7 @@ class ScreenPositionController : public aura::client::ScreenPositionClient {
                                 gfx::Point* point) override;
   void SetBounds(aura::Window* window,
                  const gfx::Rect& bounds,
-                 const gfx::Display& display) override;
+                 const display::Display& display) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScreenPositionController);