Standardize usage of virtual/override/final specifiers.

ui/views/controls/scrollbar/native_scroll_bar.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_
 #define UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 11 matching lines @@
 
 // The NativeScrollBar class is a scrollbar that uses platform's
 // native control.
 class VIEWS_EXPORT NativeScrollBar : public ScrollBar {
  public:
   // The scroll-bar's class name.
   static const char kViewClassName[];
 
   // Create new scrollbar, either horizontal or vertical.
   explicit NativeScrollBar(bool is_horiz);
-  virtual ~NativeScrollBar();
+  ~NativeScrollBar() override;
 
   // Return the system sizes.
   static int GetHorizontalScrollBarHeight(const ui::NativeTheme* theme);
   static int GetVerticalScrollBarWidth(const ui::NativeTheme* theme);
 
  private:
   friend class NativeScrollBarTest;
   FRIEND_TEST_ALL_PREFIXES(NativeScrollBarTest, Scrolling);
 
   // Overridden from View.
-  virtual gfx::Size GetPreferredSize() const override;
-  virtual void Layout() override;
-  virtual void ViewHierarchyChanged(
+  gfx::Size GetPreferredSize() const override;
+  void Layout() override;
+  void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
-  virtual const char* GetClassName() const override;
+  const char* GetClassName() const override;
 
   // Overrideen from View for keyboard UI purpose.
-  virtual bool OnKeyPressed(const ui::KeyEvent& event) override;
-  virtual bool OnMouseWheel(const ui::MouseWheelEvent& e) override;
+  bool OnKeyPressed(const ui::KeyEvent& event) override;
+  bool OnMouseWheel(const ui::MouseWheelEvent& e) override;
 
   // Overridden from ui::EventHandler.
-  virtual void OnGestureEvent(ui::GestureEvent* event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
 
   // Overridden from ScrollBar.
-  virtual void Update(int viewport_size,
-                      int content_size,
-                      int current_pos) override;
-  virtual int GetPosition() const override;
-  virtual int GetLayoutSize() const override;
+  void Update(int viewport_size, int content_size, int current_pos) override;
+  int GetPosition() const override;
+  int GetLayoutSize() const override;
 
   // init border
   NativeScrollBarWrapper* native_wrapper_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeScrollBar);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_H_