Standardize usage of virtual/override/final in remoting/

remoting/host/it2me/it2me_host.h

Index: remoting/host/it2me/it2me_host.h
diff --git a/remoting/host/it2me/it2me_host.h b/remoting/host/it2me/it2me_host.h
index c24f2d10d4e6f136f47027888180a9cd35afc276..349232d27a1c4505ff5b5c756f3e1ff8bb68a633 100644
--- a/remoting/host/it2me/it2me_host.h
+++ b/remoting/host/it2me/it2me_host.h
@@ -80,16 +80,16 @@ class It2MeHost : public base::RefCountedThreadSafe<It2MeHost>,
   virtual void RequestNatPolicy();
 
   // remoting::HostStatusObserver implementation.
-  virtual void OnAccessDenied(const std::string& jid) override;
-  virtual void OnClientAuthenticated(const std::string& jid) override;
-  virtual void OnClientDisconnected(const std::string& jid) override;
+  void OnAccessDenied(const std::string& jid) override;
+  void OnClientAuthenticated(const std::string& jid) override;
+  void OnClientDisconnected(const std::string& jid) override;
 
   void SetStateForTesting(It2MeHostState state) { SetState(state); }
 
  protected:
   friend class base::RefCountedThreadSafe<It2MeHost>;
 
-  virtual ~It2MeHost();
+  ~It2MeHost() override;
 
   ChromotingHostContext* host_context() { return host_context_; }
   scoped_refptr<base::SingleThreadTaskRunner> task_runner() {