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

ash/display/mirror_window_controller.h

Index: ash/display/mirror_window_controller.h
diff --git a/ash/display/mirror_window_controller.h b/ash/display/mirror_window_controller.h
index 34f8fa21ba9c4e57cf057e225919cf1988191385..2523eb0db5430b6f671d726402e5c1291347a9c9 100644
--- a/ash/display/mirror_window_controller.h
+++ b/ash/display/mirror_window_controller.h
@@ -32,6 +32,10 @@ namespace gfx {
 class Display;
 }
 
+namespace display {
+using Display = gfx::Display;
+}
+
 namespace ui {
 class Reflector;
 }
@@ -71,8 +75,8 @@ class ASH_EXPORT MirrorWindowController : public aura::WindowTreeHostObserver {
   // display is not mirrored by the compositor path.
   aura::Window* GetWindow();
 
-  // Returns the gfx::Display for the mirroring root window.
-  gfx::Display GetDisplayForRootWindow(const aura::Window* root) const;
+  // Returns the display::Display for the mirroring root window.
+  display::Display GetDisplayForRootWindow(const aura::Window* root) const;
 
   // Returns the AshWindwoTreeHost created for |display_id|.
   AshWindowTreeHost* GetAshWindowTreeHostForDisplayId(int64_t display_id);