Standardize usage of virtual/override/final in net/

net/http/url_security_manager.h

Index: net/http/url_security_manager.h
diff --git a/net/http/url_security_manager.h b/net/http/url_security_manager.h
index 2835d89282932ad986b78c36a3547451ba34e525..c0d93a23296cd0510dd839073b1ed2b028ab6b48 100644
--- a/net/http/url_security_manager.h
+++ b/net/http/url_security_manager.h
@@ -61,11 +61,11 @@ class URLSecurityManagerWhitelist : public URLSecurityManager {
   // The URLSecurityManagerWhitelist takes ownership of the whitelists.
   URLSecurityManagerWhitelist(const HttpAuthFilter* whitelist_default,
                               const HttpAuthFilter* whitelist_delegation);
-  virtual ~URLSecurityManagerWhitelist();
+  ~URLSecurityManagerWhitelist() override;
 
   // URLSecurityManager methods.
-  virtual bool CanUseDefaultCredentials(const GURL& auth_origin) const override;
-  virtual bool CanDelegate(const GURL& auth_origin) const override;
+  bool CanUseDefaultCredentials(const GURL& auth_origin) const override;
+  bool CanDelegate(const GURL& auth_origin) const override;
 
  private:
   scoped_ptr<const HttpAuthFilter> whitelist_default_;