Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/views/panels/panel_stack_view.cc

Index: chrome/browser/ui/views/panels/panel_stack_view.cc
diff --git a/chrome/browser/ui/views/panels/panel_stack_view.cc b/chrome/browser/ui/views/panels/panel_stack_view.cc
index a996d19f576b79c6512876e13672a989796e5ec0..841f578ce1d643b7f28fdf074f381e5e56f892f8 100644
--- a/chrome/browser/ui/views/panels/panel_stack_view.cc
+++ b/chrome/browser/ui/views/panels/panel_stack_view.cc
@@ -34,18 +34,18 @@ class PanelStackWindow : public views::WidgetObserver,
  public:
   PanelStackWindow(const gfx::Rect& bounds,
                    NativePanelStackWindowDelegate* delegate);
-  virtual ~PanelStackWindow();
+  ~PanelStackWindow() override;
 
   // Overridden from views::WidgetDelegate:
-  virtual base::string16 GetWindowTitle() const override;
-  virtual gfx::ImageSkia GetWindowAppIcon() override;
-  virtual gfx::ImageSkia GetWindowIcon() override;
-  virtual views::Widget* GetWidget() override;
-  virtual const views::Widget* GetWidget() const override;
+  base::string16 GetWindowTitle() const override;
+  gfx::ImageSkia GetWindowAppIcon() override;
+  gfx::ImageSkia GetWindowIcon() override;
+  views::Widget* GetWidget() override;
+  const views::Widget* GetWidget() const override;
 
   // Overridden from views::WidgetObserver:
-  virtual void OnWidgetClosing(views::Widget* widget) override;
-  virtual void OnWidgetDestroying(views::Widget* widget) override;
+  void OnWidgetClosing(views::Widget* widget) override;
+  void OnWidgetDestroying(views::Widget* widget) override;
 
  private:
   views::Widget* window_;  // Weak pointer, own us.