Standardize usage of virtual/override/final in chrome/browser/printing/

chrome/browser/printing/print_preview_context_menu_observer.h

Index: chrome/browser/printing/print_preview_context_menu_observer.h
diff --git a/chrome/browser/printing/print_preview_context_menu_observer.h b/chrome/browser/printing/print_preview_context_menu_observer.h
index aaf10fd95b9c3e467b6177443ec67a6b1c4ac62e..e1a11ef2b286bbb0effe6d9ecf527c00bedcc05f 100644
--- a/chrome/browser/printing/print_preview_context_menu_observer.h
+++ b/chrome/browser/printing/print_preview_context_menu_observer.h
@@ -16,11 +16,11 @@ class WebContents;
 class PrintPreviewContextMenuObserver : public RenderViewContextMenuObserver {
  public:
   explicit PrintPreviewContextMenuObserver(content::WebContents* contents);
-  virtual ~PrintPreviewContextMenuObserver();
+  ~PrintPreviewContextMenuObserver() override;
 
   // RenderViewContextMenuObserver implementation.
-  virtual bool IsCommandIdSupported(int command_id) override;
-  virtual bool IsCommandIdEnabled(int command_id) override;
+  bool IsCommandIdSupported(int command_id) override;
+  bool IsCommandIdEnabled(int command_id) override;
 
  private:
   bool IsPrintPreviewDialog();