Standardize usage of virtual/override/final in cc/

cc/test/fake_scrollbar.h

Index: cc/test/fake_scrollbar.h
diff --git a/cc/test/fake_scrollbar.h b/cc/test/fake_scrollbar.h
index 638735d7c5c2a31e91bb0504d2f1185b553012e7..2d14660e975bc712ad84e0e240448010c5d5f92d 100644
--- a/cc/test/fake_scrollbar.h
+++ b/cc/test/fake_scrollbar.h
@@ -15,20 +15,20 @@ class FakeScrollbar : public Scrollbar {
  public:
   FakeScrollbar();
   FakeScrollbar(bool paint, bool has_thumb, bool is_overlay);
-  virtual ~FakeScrollbar();
+  ~FakeScrollbar() override;
 
   // Scrollbar implementation.
-  virtual ScrollbarOrientation Orientation() const override;
-  virtual bool IsLeftSideVerticalScrollbar() const override;
-  virtual gfx::Point Location() const override;
-  virtual bool IsOverlay() const override;
-  virtual bool HasThumb() const override;
-  virtual int ThumbThickness() const override;
-  virtual int ThumbLength() const override;
-  virtual gfx::Rect TrackRect() const override;
-  virtual void PaintPart(SkCanvas* canvas,
-                         ScrollbarPart part,
-                         const gfx::Rect& content_rect) override;
+  ScrollbarOrientation Orientation() const override;
+  bool IsLeftSideVerticalScrollbar() const override;
+  gfx::Point Location() const override;
+  bool IsOverlay() const override;
+  bool HasThumb() const override;
+  int ThumbThickness() const override;
+  int ThumbLength() const override;
+  gfx::Rect TrackRect() const override;
+  void PaintPart(SkCanvas* canvas,
+                 ScrollbarPart part,
+                 const gfx::Rect& content_rect) override;
 
   void set_location(const gfx::Point& location) { location_ = location; }
   void set_track_rect(const gfx::Rect& track_rect) { track_rect_ = track_rect; }