replace OVERRIDE and FINAL with override and final in ash/

ash/wm/overview/window_grid.h

Index: ash/wm/overview/window_grid.h
diff --git a/ash/wm/overview/window_grid.h b/ash/wm/overview/window_grid.h
index 1abea8f7d93a34d75ba18c45e7b7c2bc7eb5eb6a..57e32d1510531331fbb3cbf1591c096ec6a4dac4 100644
--- a/ash/wm/overview/window_grid.h
+++ b/ash/wm/overview/window_grid.h
@@ -93,11 +93,11 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver {
   }
 
   // aura::WindowObserver:
-  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
+  virtual void OnWindowDestroying(aura::Window* window) override;
   // TODO(flackr): Handle window bounds changed in WindowSelectorItem.
   virtual void OnWindowBoundsChanged(aura::Window* window,
                                      const gfx::Rect& old_bounds,
-                                     const gfx::Rect& new_bounds) OVERRIDE;
+                                     const gfx::Rect& new_bounds) override;
 
  private:
   friend class WindowSelectorTest;