replace OVERRIDE and FINAL with override and final in ash/

ash/system/chromeos/keyboard_brightness_controller.h

Index: ash/system/chromeos/keyboard_brightness_controller.h
diff --git a/ash/system/chromeos/keyboard_brightness_controller.h b/ash/system/chromeos/keyboard_brightness_controller.h
index 1afc94b1f6b9d3318d7d05eaae327c1c5ffbfd04..f4d44e81f07ebe00463ed77c0e4a679ba1f19595 100644
--- a/ash/system/chromeos/keyboard_brightness_controller.h
+++ b/ash/system/chromeos/keyboard_brightness_controller.h
@@ -23,9 +23,9 @@ class ASH_EXPORT KeyboardBrightnessController
  private:
   // Overridden from KeyboardBrightnessControlDelegate:
   virtual bool HandleKeyboardBrightnessDown(
-      const ui::Accelerator& accelerator) OVERRIDE;
+      const ui::Accelerator& accelerator) override;
   virtual bool HandleKeyboardBrightnessUp(
-      const ui::Accelerator& accelerator) OVERRIDE;
+      const ui::Accelerator& accelerator) override;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardBrightnessController);
 };