Standardize usage of virtual/override/final in remoting/

remoting/client/key_event_mapper.h

Index: remoting/client/key_event_mapper.h
diff --git a/remoting/client/key_event_mapper.h b/remoting/client/key_event_mapper.h
index 51f3afc93dc79ce1b33eb6ed21f333c49a9c7bf7..b81c6570e1c783819cc461e29a1b8d6a02f42ff9 100644
--- a/remoting/client/key_event_mapper.h
+++ b/remoting/client/key_event_mapper.h
@@ -22,7 +22,7 @@ class KeyEventMapper : public protocol::InputFilter {
  public:
   KeyEventMapper();
   explicit KeyEventMapper(InputStub* input_stub);
-  virtual ~KeyEventMapper();
+  ~KeyEventMapper() override;
 
   // Callback type for use with SetTrapCallback(), below.
   typedef base::Callback<void(const protocol::KeyEvent&)> KeyTrapCallback;
@@ -39,7 +39,7 @@ class KeyEventMapper : public protocol::InputFilter {
   void RemapKey(uint32 in_usb_keycode, uint32 out_usb_keycode);
 
   // InputFilter overrides.
-  virtual void InjectKeyEvent(const protocol::KeyEvent& event) override;
+  void InjectKeyEvent(const protocol::KeyEvent& event) override;
 
  private:
   std::map<uint32,uint32> mapped_keys;