Standardize usage of virtual/override/final in remoting/

remoting/protocol/input_event_tracker.h

Index: remoting/protocol/input_event_tracker.h
diff --git a/remoting/protocol/input_event_tracker.h b/remoting/protocol/input_event_tracker.h
index 82e20e25714a367eff05ea43e26feda0df61bc23..e167cd2bb16688b073b8c23918dc660c35b07633 100644
--- a/remoting/protocol/input_event_tracker.h
+++ b/remoting/protocol/input_event_tracker.h
@@ -21,7 +21,7 @@ namespace protocol {
 class InputEventTracker : public InputStub {
  public:
   explicit InputEventTracker(protocol::InputStub* input_stub);
-  virtual ~InputEventTracker();
+  ~InputEventTracker() override;
 
   // Returns true if the key with the specified USB code is currently pressed.
   bool IsKeyPressed(uint32 usb_keycode) const;
@@ -34,9 +34,9 @@ class InputEventTracker : public InputStub {
   void ReleaseAll();
 
   // InputStub interface.
-  virtual void InjectKeyEvent(const KeyEvent& event) override;
-  virtual void InjectTextEvent(const TextEvent& event) override;
-  virtual void InjectMouseEvent(const MouseEvent& event) override;
+  void InjectKeyEvent(const KeyEvent& event) override;
+  void InjectTextEvent(const TextEvent& event) override;
+  void InjectMouseEvent(const MouseEvent& event) override;
 
  private:
   protocol::InputStub* input_stub_;