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

net/tools/quic/test_tools/server_thread.h

Index: net/tools/quic/test_tools/server_thread.h
diff --git a/net/tools/quic/test_tools/server_thread.h b/net/tools/quic/test_tools/server_thread.h
index cb92b0166c21a22864c740443a3cf685bfb096af..774ff67700eae1b828b4111687df3bfef6942ac2 100644
--- a/net/tools/quic/test_tools/server_thread.h
+++ b/net/tools/quic/test_tools/server_thread.h
@@ -21,14 +21,14 @@ class ServerThread : public base::SimpleThread {
                IPEndPoint address,
                bool strike_register_no_startup_period);
 
-  virtual ~ServerThread();
+  ~ServerThread() override;
 
   // Prepares the server, but does not start accepting connections. Useful for
   // injecting mocks.
   void Initialize();
 
   // Runs the event loop. Will initialize if necessary.
-  virtual void Run() override;
+  void Run() override;
 
   // Waits for the handshake to be confirmed for the first session created.
   void WaitForCryptoHandshakeConfirmed();