Standardize usage of virtual/override/final in remoting/

remoting/host/host_change_notification_listener.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H
 #define REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 19 matching lines @@
     // Invoked when a notification that the host was deleted is received.
    public:
     virtual void OnHostDeleted() = 0;
   };
 
   // Both listener and signal_strategy are expected to outlive this object.
   HostChangeNotificationListener(Listener* listener,
                                  const std::string& host_id,
                                  SignalStrategy* signal_strategy,
                                  const std::string& directory_bot_jid);
-  virtual ~HostChangeNotificationListener();
+  ~HostChangeNotificationListener() override;
 
   // SignalStrategy::Listener interface.
-  virtual void OnSignalStrategyStateChange(
-      SignalStrategy::State state) override;
-  virtual bool OnSignalStrategyIncomingStanza(
-      const buzz::XmlElement* stanza) override;
+  void OnSignalStrategyStateChange(SignalStrategy::State state) override;
+  bool OnSignalStrategyIncomingStanza(const buzz::XmlElement* stanza) override;
 
  private:
   void OnHostDeleted();
 
   Listener* listener_;
   std::string host_id_;
   SignalStrategy* signal_strategy_;
   std::string directory_bot_jid_;
   base::WeakPtrFactory<HostChangeNotificationListener> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(HostChangeNotificationListener);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_CHANGE_NOTIFICATION_LISTENER_H