Standardize usage of virtual/override/final specifiers.

ash/wm/window_cycle_controller.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 "ash/wm/window_cycle_controller.h"
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/window_cycle_list.h"
 #include "base/metrics/histogram.h"
 #include "ui/events/event.h"
 #include "ui/events/event_handler.h"
 
 namespace ash {
 
 namespace {
 
 // Filter to watch for the termination of a keyboard gesture to cycle through
 // multiple windows.
 class WindowCycleEventFilter : public ui::EventHandler {
  public:
   WindowCycleEventFilter();
-  virtual ~WindowCycleEventFilter();
+  ~WindowCycleEventFilter() override;
 
   // Overridden from ui::EventHandler:
-  virtual void OnKeyEvent(ui::KeyEvent* event) override;
+  void OnKeyEvent(ui::KeyEvent* event) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WindowCycleEventFilter);
 };
 
 WindowCycleEventFilter::WindowCycleEventFilter() {
   Shell::GetInstance()->AddPreTargetHandler(this);
 }
 
 WindowCycleEventFilter::~WindowCycleEventFilter() {
@@ skipping 56 matching lines @@
 
 void WindowCycleController::StopCycling() {
   window_cycle_list_.reset();
   // Remove our key event filter.
   event_handler_.reset();
   UMA_HISTOGRAM_MEDIUM_TIMES("Ash.WindowCycleController.CycleTime",
                              base::Time::Now() - cycle_start_time_);
 }
 
 }  // namespace ash