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

chrome/browser/safe_browsing/protocol_manager.h

Index: chrome/browser/safe_browsing/protocol_manager.h
diff --git a/chrome/browser/safe_browsing/protocol_manager.h b/chrome/browser/safe_browsing/protocol_manager.h
index 3eb549a41844807ee878b417e1763ba35770fbdb..ae357f8afeb3675ff6d391e23a5e63c8fdffd57e 100644
--- a/chrome/browser/safe_browsing/protocol_manager.h
+++ b/chrome/browser/safe_browsing/protocol_manager.h
@@ -51,7 +51,7 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
   typedef base::Callback<void(const std::vector<SBFullHashResult>&,
                               const base::TimeDelta&)> FullHashCallback;
 
-  virtual ~SafeBrowsingProtocolManager();
+  ~SafeBrowsingProtocolManager() override;
 
   // Makes the passed |factory| the factory used to instantiate
   // a SafeBrowsingService. Useful for tests.
@@ -70,7 +70,7 @@ class SafeBrowsingProtocolManager : public net::URLFetcherDelegate,
   virtual void Initialize();
 
   // net::URLFetcherDelegate interface.
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // Retrieve the full hash for a set of prefixes, and invoke the callback
   // argument when the results are retrieved. The callback may be invoked