Standardize usage of virtual/override/final in ui/

ui/gfx/display_change_notifier_unittest.cc

 // Copyright 2014 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.
 
 #include "ui/gfx/display_change_notifier.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/display_observer.h"
 
 namespace gfx {
 
 class MockDisplayObserver : public DisplayObserver {
  public:
   MockDisplayObserver()
     : display_added_(0),
       display_removed_(0),
       display_changed_(0),
       latest_metrics_change_(DisplayObserver::DISPLAY_METRIC_NONE)
   {}
 
-  virtual ~MockDisplayObserver() { }
+  ~MockDisplayObserver() override {}
 
-  virtual void OnDisplayAdded(const Display& display) override {
-    display_added_++;
-  }
+  void OnDisplayAdded(const Display& display) override { display_added_++; }
 
-  virtual void OnDisplayRemoved(const Display& display) override {
-    display_removed_++;
-  }
+  void OnDisplayRemoved(const Display& display) override { display_removed_++; }
 
-  virtual void OnDisplayMetricsChanged(const Display& display,
-                                       uint32_t metrics) override {
+  void OnDisplayMetricsChanged(const Display& display,
+                               uint32_t metrics) override {
     display_changed_++;
     latest_metrics_change_ = metrics;
   }
 
   int display_added() const {
     return display_added_;
   }
 
   int display_removed() const {
     return display_removed_;
@@ skipping 445 matching lines @@
   change_notifier.NotifyDisplaysChanged(old_displays, new_displays);
   EXPECT_EQ(1, observer.display_changed());
   uint32_t metrics = DisplayObserver::DISPLAY_METRIC_BOUNDS |
                          DisplayObserver::DISPLAY_METRIC_ROTATION |
                          DisplayObserver::DISPLAY_METRIC_WORK_AREA |
                          DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
   EXPECT_EQ(metrics, observer.latest_metrics_change());
 }
 
 } // namespace gfx