Standardize usage of virtual/override/final in remoting/

remoting/signaling/iq_sender.h

Index: remoting/signaling/iq_sender.h
diff --git a/remoting/signaling/iq_sender.h b/remoting/signaling/iq_sender.h
index 51879d4af1cbe8f02ecab8398607fc3832132893..02744eda137dc0222eabef1280e6be4f9fb4e2f2 100644
--- a/remoting/signaling/iq_sender.h
+++ b/remoting/signaling/iq_sender.h
@@ -38,7 +38,7 @@ class IqSender : public SignalStrategy::Listener {
                               const buzz::XmlElement* response)> ReplyCallback;
 
   explicit IqSender(SignalStrategy* signal_strategy);
-  virtual ~IqSender();
+  ~IqSender() override;
 
   // Send an iq stanza. Returns an IqRequest object that represends
   // the request. |callback| is called when response to |stanza| is
@@ -55,10 +55,8 @@ class IqSender : public SignalStrategy::Listener {
                                const ReplyCallback& callback);
 
   // SignalStrategy::Listener implementation.
-  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:
   typedef std::map<std::string, IqRequest*> IqRequestMap;