Standardize usage of virtual/override/final specifiers.

ui/views/controls/table/table_header.h

Index: ui/views/controls/table/table_header.h
diff --git a/ui/views/controls/table/table_header.h b/ui/views/controls/table/table_header.h
index 55c0949cdf47192e04d6d7d9ab03f702b43aaf87..b048a29ac15091aa22475886cb855f999740c90d 100644
--- a/ui/views/controls/table/table_header.h
+++ b/ui/views/controls/table/table_header.h
@@ -23,20 +23,20 @@ class VIEWS_EXPORT TableHeader : public views::View {
   static const int kSortIndicatorWidth;
 
   explicit TableHeader(TableView* table);
-  virtual ~TableHeader();
+  ~TableHeader() override;
 
   const gfx::FontList& font_list() const { return font_list_; }
 
   // views::View overrides.
-  virtual void Layout() override;
-  virtual void OnPaint(gfx::Canvas* canvas) override;
-  virtual gfx::Size GetPreferredSize() const override;
-  virtual gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
-  virtual bool OnMousePressed(const ui::MouseEvent& event) override;
-  virtual bool OnMouseDragged(const ui::MouseEvent& event) override;
-  virtual void OnMouseReleased(const ui::MouseEvent& event) override;
-  virtual void OnMouseCaptureLost() override;
-  virtual void OnGestureEvent(ui::GestureEvent* event) override;
+  void Layout() override;
+  void OnPaint(gfx::Canvas* canvas) override;
+  gfx::Size GetPreferredSize() const override;
+  gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
+  bool OnMousePressed(const ui::MouseEvent& event) override;
+  bool OnMouseDragged(const ui::MouseEvent& event) override;
+  void OnMouseReleased(const ui::MouseEvent& event) override;
+  void OnMouseCaptureLost() override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
  private:
   // Used to track the column being resized.