Standardize usage of virtual/override/final in net/

net/base/sdch_manager.h

Index: net/base/sdch_manager.h
diff --git a/net/base/sdch_manager.h b/net/base/sdch_manager.h
index 18f67491a08eb6bfb3d0f6b9053721e9491f5e85..b5f901b036414bb6cb24e1d4f9ceefb5384a5a87 100644
--- a/net/base/sdch_manager.h
+++ b/net/base/sdch_manager.h
@@ -252,7 +252,7 @@ class NET_EXPORT SdchManager
   };
 
   SdchManager();
-  virtual ~SdchManager();
+  ~SdchManager() override;
 
   // Clear data (for browser data removal).
   void ClearData();
@@ -355,8 +355,8 @@ class NET_EXPORT SdchManager
   // dictionaries. This addition will fail if addition is illegal
   // (data in the dictionary is not acceptable from the
   // dictionary_url; dictionary already added, etc.).
-  virtual void AddSdchDictionary(const std::string& dictionary_text,
-                                 const GURL& dictionary_url) override;
+  void AddSdchDictionary(const std::string& dictionary_text,
+                         const GURL& dictionary_url) override;
 
  private:
   struct BlacklistInfo {