Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/libgtk2ui/gtk2_status_icon.h

Index: chrome/browser/ui/libgtk2ui/gtk2_status_icon.h
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_status_icon.h b/chrome/browser/ui/libgtk2ui/gtk2_status_icon.h
index 24019774160aa2a2bed2dc2cb5e8999bba33d956..89934a78a088996dc6175554f762ddef6d93a293 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_status_icon.h
+++ b/chrome/browser/ui/libgtk2ui/gtk2_status_icon.h
@@ -30,13 +30,13 @@ class AppIndicatorIconMenu;
 class Gtk2StatusIcon : public views::StatusIconLinux {
  public:
   Gtk2StatusIcon(const gfx::ImageSkia& image, const base::string16& tool_tip);
-  virtual ~Gtk2StatusIcon();
+  ~Gtk2StatusIcon() override;
 
   // Overridden from views::StatusIconLinux:
-  virtual void SetImage(const gfx::ImageSkia& image) override;
-  virtual void SetToolTip(const base::string16& tool_tip) override;
-  virtual void UpdatePlatformContextMenu(ui::MenuModel* menu) override;
-  virtual void RefreshPlatformContextMenu() override;
+  void SetImage(const gfx::ImageSkia& image) override;
+  void SetToolTip(const base::string16& tool_tip) override;
+  void UpdatePlatformContextMenu(ui::MenuModel* menu) override;
+  void RefreshPlatformContextMenu() override;
 
  private:
   CHROMEG_CALLBACK_0(Gtk2StatusIcon, void, OnClick, GtkStatusIcon*);