Standardize usage of virtual/override/final specifiers.

ui/views/controls/scrollbar/overlay_scroll_bar.cc

 // Copyright 2013 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.
 
 #include "ui/views/controls/scrollbar/overlay_scroll_bar.h"
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
 
 namespace views {
 namespace {
 
 const int kScrollbarWidth = 10;
 const int kThumbInsetInside = 3;
 const int kThumbInsetFromEdge = 1;
 const int kThumbCornerRadius = 2;
 const int kThumbMinimumSize = kScrollbarWidth;
 const int kThumbHoverAlpha = 128;
 const int kThumbDefaultAlpha = 64;
 
 class OverlayScrollBarThumb : public BaseScrollBarThumb,
                               public gfx::AnimationDelegate {
  public:
   explicit OverlayScrollBarThumb(BaseScrollBar* scroll_bar);
-  virtual ~OverlayScrollBarThumb();
+  ~OverlayScrollBarThumb() override;
 
  protected:
   // View overrides:
-  virtual gfx::Size GetPreferredSize() const override;
-  virtual void OnPaint(gfx::Canvas* canvas) override;
+  gfx::Size GetPreferredSize() const override;
+  void OnPaint(gfx::Canvas* canvas) override;
 
   // gfx::AnimationDelegate overrides:
-  virtual void AnimationProgressed(const gfx::Animation* animation) override;
+  void AnimationProgressed(const gfx::Animation* animation) override;
 
  private:
   double animation_opacity_;
   DISALLOW_COPY_AND_ASSIGN(OverlayScrollBarThumb);
 };
 
 OverlayScrollBarThumb::OverlayScrollBarThumb(BaseScrollBar* scroll_bar)
     : BaseScrollBarThumb(scroll_bar),
       animation_opacity_(0.0) {
   // This is necessary, otherwise the thumb will be rendered below the views if
@@ skipping 104 matching lines @@
     thumb_bounds.set_y(thumb->y());
     thumb_bounds.set_height(thumb->height());
   }
   thumb->SetBoundsRect(thumb_bounds);
 }
 
 void OverlayScrollBar::OnPaint(gfx::Canvas* canvas) {
 }
 
 }  // namespace views