Standardize usage of virtual/override/final in net/

net/base/net_log_logger.h

Index: net/base/net_log_logger.h
diff --git a/net/base/net_log_logger.h b/net/base/net_log_logger.h
index 6604b82e3354db8609bcb8fca84afbfea84eb587..406841e4891219eb750c3426de5030be0997ecef 100644
--- a/net/base/net_log_logger.h
+++ b/net/base/net_log_logger.h
@@ -28,7 +28,7 @@ class NET_EXPORT NetLogLogger : public NetLog::ThreadSafeObserver {
   // starts.  |file| must be non-NULL handle and be open for writing.
   // |constants| is a legend for decoding constant values used in the log.
   NetLogLogger(FILE* file, const base::Value& constants);
-  virtual ~NetLogLogger();
+  ~NetLogLogger() override;
 
   // Sets the log level to log at. Must be called before StartObserving.
   void set_log_level(NetLog::LogLevel log_level);
@@ -41,7 +41,7 @@ class NET_EXPORT NetLogLogger : public NetLog::ThreadSafeObserver {
   void StopObserving();
 
   // net::NetLog::ThreadSafeObserver implementation:
-  virtual void OnAddEntry(const NetLog::Entry& entry) override;
+  void OnAddEntry(const NetLog::Entry& entry) override;
 
   // Create a dictionary containing legend for net/ constants.  Caller takes
   // ownership of returned value.