Standardize usage of virtual/override/final in chrome/browser/ui/

chrome/browser/ui/zoom/zoom_controller_browsertest.cc

Index: chrome/browser/ui/zoom/zoom_controller_browsertest.cc
diff --git a/chrome/browser/ui/zoom/zoom_controller_browsertest.cc b/chrome/browser/ui/zoom/zoom_controller_browsertest.cc
index 748056682ce774562398a027c5e61dba2fee075a..8cbd925c407c46427359e0d57c756a17416ec5f4 100644
--- a/chrome/browser/ui/zoom/zoom_controller_browsertest.cc
+++ b/chrome/browser/ui/zoom/zoom_controller_browsertest.cc
@@ -42,11 +42,11 @@ class ZoomChangedWatcher : public ZoomObserver {
         message_loop_runner_(new content::MessageLoopRunner) {
     ZoomController::FromWebContents(web_contents)->AddObserver(this);
   }
-  virtual ~ZoomChangedWatcher() {}
+  ~ZoomChangedWatcher() override {}
 
   void Wait() { message_loop_runner_->Run(); }
 
-  virtual void OnZoomChanged(
+  void OnZoomChanged(
       const ZoomController::ZoomChangedEventData& event_data) override {
     if (event_data == expected_event_data_)
       message_loop_runner_->Quit();