Standardize usage of virtual/override/final in net/

net/url_request/url_request.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 260 matching lines @@
     // and bytes read will be -1.
     virtual void OnReadCompleted(URLRequest* request, int bytes_read) = 0;
 
    protected:
     virtual ~Delegate() {}
   };
 
   // If destroyed after Start() has been called but while IO is pending,
   // then the request will be effectively canceled and the delegate
   // will not have any more of its methods called.
-  virtual ~URLRequest();
+  ~URLRequest() override;
 
   // Changes the default cookie policy from allowing all cookies to blocking all
   // cookies. Embedders that want to implement a more flexible policy should
   // change the default to blocking all cookies, and provide a NetworkDelegate
   // with the URLRequestContext that maintains the CookieStore.
   // The cookie policy default has to be set before the first URLRequest is
   // started. Once it was set to block all cookies, it cannot be changed back.
   static void SetDefaultCookiePolicyToBlock();
 
   // Returns true if the scheme can be handled by URLRequest. False otherwise.
@@ skipping 604 matching lines @@
 
   // The proxy server used for this request, if any.
   HostPortPair proxy_server_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_