Standardize usage of virtual/override/final in remoting/

remoting/host/gnubby_auth_handler_posix_unittest.cc

Index: remoting/host/gnubby_auth_handler_posix_unittest.cc
diff --git a/remoting/host/gnubby_auth_handler_posix_unittest.cc b/remoting/host/gnubby_auth_handler_posix_unittest.cc
index 139a560283a7d588b39b321ce0f1180366caa3b8..2a055ac50bdad44ce625354e5dbe8d32427ff63d 100644
--- a/remoting/host/gnubby_auth_handler_posix_unittest.cc
+++ b/remoting/host/gnubby_auth_handler_posix_unittest.cc
@@ -42,10 +42,10 @@ class MockStreamListenSocket : public net::StreamListenSocket {
   explicit MockStreamListenSocket(net::StreamListenSocket::Delegate* delegate)
       : StreamListenSocket(net::kInvalidSocket, delegate) {}
 
-  virtual void Accept() override { NOTREACHED(); }
+  void Accept() override { NOTREACHED(); }
 
  private:
-  virtual ~MockStreamListenSocket() {}
+  ~MockStreamListenSocket() override {}
 };
 
 }  // namespace