Standardize usage of virtual/override/final in remoting/

remoting/client/plugin/delegating_signal_strategy.h

Index: remoting/client/plugin/delegating_signal_strategy.h
diff --git a/remoting/client/plugin/delegating_signal_strategy.h b/remoting/client/plugin/delegating_signal_strategy.h
index e78a47c6c8f4a0594cf346312bfc3329234de3d0..12fb5958dd16fa7be61652f907a542058328416f 100644
--- a/remoting/client/plugin/delegating_signal_strategy.h
+++ b/remoting/client/plugin/delegating_signal_strategy.h
@@ -21,20 +21,20 @@ class DelegatingSignalStrategy : public SignalStrategy {
 
   DelegatingSignalStrategy(std::string local_jid,
                        const SendIqCallback& send_iq_callback);
-  virtual ~DelegatingSignalStrategy();
+  ~DelegatingSignalStrategy() override;
 
   void OnIncomingMessage(const std::string& message);
 
   // SignalStrategy interface.
-  virtual void Connect() override;
-  virtual void Disconnect() override;
-  virtual State GetState() const override;
-  virtual Error GetError() const override;
-  virtual std::string GetLocalJid() const override;
-  virtual void AddListener(Listener* listener) override;
-  virtual void RemoveListener(Listener* listener) override;
-  virtual bool SendStanza(scoped_ptr<buzz::XmlElement> stanza) override;
-  virtual std::string GetNextId() override;
+  void Connect() override;
+  void Disconnect() override;
+  State GetState() const override;
+  Error GetError() const override;
+  std::string GetLocalJid() const override;
+  void AddListener(Listener* listener) override;
+  void RemoveListener(Listener* listener) override;
+  bool SendStanza(scoped_ptr<buzz::XmlElement> stanza) override;
+  std::string GetNextId() override;
 
  private:
   std::string local_jid_;