Standardize usage of virtual/override/final in ui/

ui/events/test/platform_event_waiter.h

Index: ui/events/test/platform_event_waiter.h
diff --git a/ui/events/test/platform_event_waiter.h b/ui/events/test/platform_event_waiter.h
index 647a011565b1b4b8ea2adbad3d15f3e62c24bd23..bdab29ed0bcd571a94a2230e7eb8e0cd8c572123 100644
--- a/ui/events/test/platform_event_waiter.h
+++ b/ui/events/test/platform_event_waiter.h
@@ -20,11 +20,11 @@ class PlatformEventWaiter : public PlatformEventObserver {
  private:
   PlatformEventWaiter(const base::Closure& success_callback,
                       const PlatformEventMatcher& event_matcher);
-  virtual ~PlatformEventWaiter();
+  ~PlatformEventWaiter() override;
 
   // PlatformEventObserver:
-  virtual void WillProcessEvent(const PlatformEvent& event) override;
-  virtual void DidProcessEvent(const PlatformEvent& event) override;
+  void WillProcessEvent(const PlatformEvent& event) override;
+  void DidProcessEvent(const PlatformEvent& event) override;
 
   base::Closure success_callback_;
   PlatformEventMatcher event_matcher_;