replace OVERRIDE and FINAL with override and final in ash/

ash/system/chromeos/tray_display.h

Index: ash/system/chromeos/tray_display.h
diff --git a/ash/system/chromeos/tray_display.h b/ash/system/chromeos/tray_display.h
index fc01ba2f7c9128f6f8fe4bd86c02decba6b2807a..46556207995c5c04b952bc5813e4636e22e11892 100644
--- a/ash/system/chromeos/tray_display.h
+++ b/ash/system/chromeos/tray_display.h
@@ -28,7 +28,7 @@ class ASH_EXPORT TrayDisplay : public SystemTrayItem,
   virtual ~TrayDisplay();
 
   // Overridden from DisplayControllerObserver:
-  virtual void OnDisplayConfigurationChanged() OVERRIDE;
+  virtual void OnDisplayConfigurationChanged() override;
 
  private:
   friend class TrayDisplayTest;
@@ -57,8 +57,8 @@ class ASH_EXPORT TrayDisplay : public SystemTrayItem,
                                   const base::string16& additional_message);
 
   // Overridden from SystemTrayItem.
-  virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
-  virtual void DestroyDefaultView() OVERRIDE;
+  virtual views::View* CreateDefaultView(user::LoginStatus status) override;
+  virtual void DestroyDefaultView() override;
 
   // Test accessors.
   base::string16 GetDefaultViewMessage() const;