Standardize usage of virtual/override/final in net/

net/url_request/url_request_throttler_manager.h

Index: net/url_request/url_request_throttler_manager.h
diff --git a/net/url_request/url_request_throttler_manager.h b/net/url_request/url_request_throttler_manager.h
index 10c656112869c11fb9620a52af800418b06a5fb5..ee2f2212799342f92e3b0c031f0d360da7c8b3fc 100644
--- a/net/url_request/url_request_throttler_manager.h
+++ b/net/url_request/url_request_throttler_manager.h
@@ -38,7 +38,7 @@ class NET_EXPORT URLRequestThrottlerManager
       public NetworkChangeNotifier::ConnectionTypeObserver {
  public:
   URLRequestThrottlerManager();
-  virtual ~URLRequestThrottlerManager();
+  ~URLRequestThrottlerManager() override;
 
   // Must be called for every request, returns the URL request throttler entry
   // associated with the URL. The caller must inform this entry of some events.
@@ -78,10 +78,10 @@ class NET_EXPORT URLRequestThrottlerManager
   NetLog* net_log() const;
 
   // IPAddressObserver interface.
-  virtual void OnIPAddressChanged() override;
+  void OnIPAddressChanged() override;
 
   // ConnectionTypeObserver interface.
-  virtual void OnConnectionTypeChanged(
+  void OnConnectionTypeChanged(
       NetworkChangeNotifier::ConnectionType type) override;
 
   // Method that allows us to transform a URL into an ID that can be used in our