Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/views/panels/x11_panel_resizer.h

Index: chrome/browser/ui/views/panels/x11_panel_resizer.h
diff --git a/chrome/browser/ui/views/panels/x11_panel_resizer.h b/chrome/browser/ui/views/panels/x11_panel_resizer.h
index a1d26447cc0a9bf8aec3bc5a3d7712ca8e3affb1..7a10db135b29c520f355fe68cc70b08627c7fa64 100644
--- a/chrome/browser/ui/views/panels/x11_panel_resizer.h
+++ b/chrome/browser/ui/views/panels/x11_panel_resizer.h
@@ -26,7 +26,7 @@ class Panel;
 class X11PanelResizer : public ui::EventHandler {
  public:
   X11PanelResizer(Panel* panel, aura::Window* window);
-  virtual ~X11PanelResizer();
+  ~X11PanelResizer() override;
 
  private:
   enum ResizeState {
@@ -51,7 +51,7 @@ class X11PanelResizer : public ui::EventHandler {
   void StopResizing(ui::MouseEvent* event, bool canceled);
 
   // ui::EventHandler:
-  virtual void OnMouseEvent(ui::MouseEvent* event) override;
+  void OnMouseEvent(ui::MouseEvent* event) override;
 
   // The panel being resized.
   Panel* panel_;