Update from chromium https://crrev.com/301725/

net/tools/quic/quic_server.h

Index: net/tools/quic/quic_server.h
diff --git a/net/tools/quic/quic_server.h b/net/tools/quic/quic_server.h
index a027a49973f765f323cfea04b1f05fff0d0d3834..980f9ba29ed07872f6bbd46eae3092ba039dbff7 100644
--- a/net/tools/quic/quic_server.h
+++ b/net/tools/quic/quic_server.h
@@ -33,7 +33,7 @@ class QuicServer : public EpollCallbackInterface {
   QuicServer(const QuicConfig& config,
              const QuicVersionVector& supported_versions);
 
-  virtual ~QuicServer();
+  ~QuicServer() override;
 
   // Start listening on the specified address.
   bool Listen(const IPEndPoint& address);
@@ -45,12 +45,10 @@ class QuicServer : public EpollCallbackInterface {
   void Shutdown();
 
   // From EpollCallbackInterface
-  virtual void OnRegistration(EpollServer* eps,
-                              int fd,
-                              int event_mask) override {}
-  virtual void OnModification(int fd, int event_mask) override {}
-  virtual void OnEvent(int fd, EpollEvent* event) override;
-  virtual void OnUnregistration(int fd, bool replaced) override {}
+  void OnRegistration(EpollServer* eps, int fd, int event_mask) override {}
+  void OnModification(int fd, int event_mask) override {}
+  void OnEvent(int fd, EpollEvent* event) override;
+  void OnUnregistration(int fd, bool replaced) override {}
 
   // Reads a packet from the given fd, and then passes it off to
   // the QuicDispatcher.  Returns true if a packet is read, false
@@ -62,7 +60,7 @@ class QuicServer : public EpollCallbackInterface {
                                           ProcessPacketInterface* processor,
                                           uint32* packets_dropped);
 
-  virtual void OnShutdown(EpollServer* eps, int fd) override {}
+  void OnShutdown(EpollServer* eps, int fd) override {}
 
   void SetStrikeRegisterNoStartupPeriod() {
     crypto_config_.set_strike_register_no_startup_period();