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

chrome/browser/download/download_resource_throttle.h

Index: chrome/browser/download/download_resource_throttle.h
diff --git a/chrome/browser/download/download_resource_throttle.h b/chrome/browser/download/download_resource_throttle.h
index b8858f591f9b61bf3d377311858f28d43f03c8bb..1795dbe2e2786566e46e4ac129710251a06cd18c 100644
--- a/chrome/browser/download/download_resource_throttle.h
+++ b/chrome/browser/download/download_resource_throttle.h
@@ -29,13 +29,13 @@ class DownloadResourceThrottle
                            const std::string& request_method);
 
   // content::ResourceThrottle implementation:
-  virtual void WillStartRequest(bool* defer) override;
-  virtual void WillRedirectRequest(const GURL& new_url, bool* defer) override;
-  virtual void WillProcessResponse(bool* defer) override;
-  virtual const char* GetNameForLogging() const override;
+  void WillStartRequest(bool* defer) override;
+  void WillRedirectRequest(const GURL& new_url, bool* defer) override;
+  void WillProcessResponse(bool* defer) override;
+  const char* GetNameForLogging() const override;
 
  private:
-  virtual ~DownloadResourceThrottle();
+  ~DownloadResourceThrottle() override;
 
   void WillDownload(bool* defer);
   void ContinueDownload(bool allow);