[ash] Cleanup of ScopedOverviewAnimationSettings

ash/wm/overview/scoped_overview_animation_settings_factory.h

Index: ash/wm/overview/scoped_overview_animation_settings_factory.h
diff --git a/ash/wm/overview/scoped_overview_animation_settings_factory.h b/ash/wm/overview/scoped_overview_animation_settings_factory.h
index b22bde2b9ab26015e44c5e9bd8d23d72da7cfed5..eace9f5f7fda277db3f5dafa6a48a6f52d37a6ac 100644
--- a/ash/wm/overview/scoped_overview_animation_settings_factory.h
+++ b/ash/wm/overview/scoped_overview_animation_settings_factory.h
@@ -22,14 +22,13 @@ class ScopedOverviewAnimationSettingsFactory {
  public:
   static ScopedOverviewAnimationSettingsFactory* Get();
 
-  virtual std::unique_ptr<ScopedOverviewAnimationSettings>
-  CreateOverviewAnimationSettings(OverviewAnimationType animation_type,
-                                  aura::Window* window) = 0;
-
- protected:
   ScopedOverviewAnimationSettingsFactory();
   virtual ~ScopedOverviewAnimationSettingsFactory();
 
+  std::unique_ptr<ScopedOverviewAnimationSettings>
+  CreateOverviewAnimationSettings(OverviewAnimationType animation_type,
+                                  aura::Window* window);
+
  private:
   static ScopedOverviewAnimationSettingsFactory* instance_;
 };