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

chrome/browser/safe_browsing/ping_manager.h

Index: chrome/browser/safe_browsing/ping_manager.h
diff --git a/chrome/browser/safe_browsing/ping_manager.h b/chrome/browser/safe_browsing/ping_manager.h
index d48cc4f602a59d9fd69eefad6faaef4d51ef5e3c..a33559b532b2fa0951bd966696acb628ff62256d 100644
--- a/chrome/browser/safe_browsing/ping_manager.h
+++ b/chrome/browser/safe_browsing/ping_manager.h
@@ -25,7 +25,7 @@ class URLRequestContextGetter;
 
 class SafeBrowsingPingManager : public net::URLFetcherDelegate {
  public:
-  virtual ~SafeBrowsingPingManager();
+  ~SafeBrowsingPingManager() override;
 
   // Create an instance of the safe browsing ping manager.
   static SafeBrowsingPingManager* Create(
@@ -33,7 +33,7 @@ class SafeBrowsingPingManager : public net::URLFetcherDelegate {
       const SafeBrowsingProtocolConfig& config);
 
   // net::URLFetcherDelegate interface.
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // For UMA users we report to Google when a SafeBrowsing interstitial is shown
   // to the user.  |threat_type| should be one of the types known by