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

chrome/browser/download/download_danger_prompt.cc

Index: chrome/browser/download/download_danger_prompt.cc
diff --git a/chrome/browser/download/download_danger_prompt.cc b/chrome/browser/download/download_danger_prompt.cc
index e815a8fbda45553dcb2076fc96c15b680391ca27..f581e42b6408ba8d18ccab4cf71b672b937b6a56 100644
--- a/chrome/browser/download/download_danger_prompt.cc
+++ b/chrome/browser/download/download_danger_prompt.cc
@@ -35,23 +35,23 @@ class DownloadDangerPromptImpl : public DownloadDangerPrompt,
                            content::WebContents* web_contents,
                            bool show_context,
                            const OnDone& done);
-  virtual ~DownloadDangerPromptImpl();
+  ~DownloadDangerPromptImpl() override;
 
   // DownloadDangerPrompt:
-  virtual void InvokeActionForTesting(Action action) override;
+  void InvokeActionForTesting(Action action) override;
 
  private:
   // content::DownloadItem::Observer:
-  virtual void OnDownloadUpdated(content::DownloadItem* download) override;
+  void OnDownloadUpdated(content::DownloadItem* download) override;
 
   // TabModalConfirmDialogDelegate:
-  virtual base::string16 GetTitle() override;
-  virtual base::string16 GetDialogMessage() override;
-  virtual base::string16 GetAcceptButtonTitle() override;
-  virtual base::string16 GetCancelButtonTitle() override;
-  virtual void OnAccepted() override;
-  virtual void OnCanceled() override;
-  virtual void OnClosed() override;
+  base::string16 GetTitle() override;
+  base::string16 GetDialogMessage() override;
+  base::string16 GetAcceptButtonTitle() override;
+  base::string16 GetCancelButtonTitle() override;
+  void OnAccepted() override;
+  void OnCanceled() override;
+  void OnClosed() override;
 
   void RunDone(Action action);