replace OVERRIDE and FINAL with override and final in ash/

ash/system/tray/tray_popup_header_button.h

Index: ash/system/tray/tray_popup_header_button.h
diff --git a/ash/system/tray/tray_popup_header_button.h b/ash/system/tray/tray_popup_header_button.h
index 41a76276a3991bc4add41c6620f22ef697c7139b..e6e4c574bebbe2315cd6a3170d60ac613e12e2d0 100644
--- a/ash/system/tray/tray_popup_header_button.h
+++ b/ash/system/tray/tray_popup_header_button.h
@@ -28,12 +28,12 @@ class ASH_EXPORT TrayPopupHeaderButton : public views::ToggleImageButton {
 
  private:
   // Overridden from views::View:
-  virtual const char* GetClassName() const OVERRIDE;
-  virtual gfx::Size GetPreferredSize() const OVERRIDE;
-  virtual void OnPaintBorder(gfx::Canvas* canvas) OVERRIDE;
+  virtual const char* GetClassName() const override;
+  virtual gfx::Size GetPreferredSize() const override;
+  virtual void OnPaintBorder(gfx::Canvas* canvas) override;
 
   // Overridden from views::CustomButton:
-  virtual void StateChanged() OVERRIDE;
+  virtual void StateChanged() override;
 
   DISALLOW_COPY_AND_ASSIGN(TrayPopupHeaderButton);
 };