Standardize usage of virtual/override/final in net/

net/http/http_auth_filter.h

Index: net/http/http_auth_filter.h
diff --git a/net/http/http_auth_filter.h b/net/http/http_auth_filter.h
index 419b8afc6e4759eba521905ee505e52ee7997254..260da47c16d1832189e498e7f98ee0c7c57ff84a 100644
--- a/net/http/http_auth_filter.h
+++ b/net/http/http_auth_filter.h
@@ -35,7 +35,7 @@ class NET_EXPORT_PRIVATE HttpAuthFilter {
 class NET_EXPORT HttpAuthFilterWhitelist : public HttpAuthFilter {
  public:
   explicit HttpAuthFilterWhitelist(const std::string& server_whitelist);
-  virtual ~HttpAuthFilterWhitelist();
+  ~HttpAuthFilterWhitelist() override;
 
   // Adds an individual URL |filter| to the list, of the specified |target|.
   bool AddFilter(const std::string& filter, HttpAuth::Target target);
@@ -46,7 +46,7 @@ class NET_EXPORT HttpAuthFilterWhitelist : public HttpAuthFilter {
   const ProxyBypassRules& rules() const { return rules_; }
 
   // HttpAuthFilter methods:
-  virtual bool IsValid(const GURL& url, HttpAuth::Target target) const override;
+  bool IsValid(const GURL& url, HttpAuth::Target target) const override;
 
  private:
   // Installs the whitelist.