Standardize usage of virtual/override/final in ui/

ui/events/test/events_test_utils.h

 // Copyright 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 UI_EVENTS_TEST_EVENTS_TEST_UTILS_H_
 #define UI_EVENTS_TEST_EVENTS_TEST_UTILS_H_
 
 #include "ui/events/event.h"
 #include "ui/events/event_dispatcher.h"
 #include "ui/events/event_target.h"
@@ skipping 19 matching lines @@
   EventTestApi();
 
   Event* event_;
 
   DISALLOW_COPY_AND_ASSIGN(EventTestApi);
 };
 
 class LocatedEventTestApi : public EventTestApi {
  public:
   explicit LocatedEventTestApi(LocatedEvent* located_event);
-  virtual ~LocatedEventTestApi();
+  ~LocatedEventTestApi() override;
 
   void set_location(const gfx::Point& location) {
     located_event_->location_ = location;
   }
 
  private:
   LocatedEventTestApi();
 
   LocatedEvent* located_event_;
 
   DISALLOW_COPY_AND_ASSIGN(LocatedEventTestApi);
 };
 
 class KeyEventTestApi : public EventTestApi {
  public:
   explicit KeyEventTestApi(KeyEvent* key_event);
-  virtual ~KeyEventTestApi();
+  ~KeyEventTestApi() override;
 
   void set_is_char(bool is_char) {
     key_event_->set_is_char(is_char);
   }
 
  private:
   KeyEventTestApi();
 
   KeyEvent* key_event_;
 
@@ skipping 26 matching lines @@
   EventSourceTestApi();
 
   EventSource* event_source_;
 
   DISALLOW_COPY_AND_ASSIGN(EventSourceTestApi);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_TEST_EVENTS_TEST_UTILS_H_