Standardize usage of virtual/override/final specifiers.

ash/sticky_keys/sticky_keys_overlay.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/sticky_keys/sticky_keys_overlay.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "base/strings/string_util.h"
@@ skipping 29 matching lines @@
 const int kSlideAnimationDurationMs = 100;
 
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 //  StickyKeyOverlayLabel
 class StickyKeyOverlayLabel : public views::Label {
  public:
   explicit StickyKeyOverlayLabel(const std::string& key_name);
 
-  virtual ~StickyKeyOverlayLabel();
+  ~StickyKeyOverlayLabel() override;
 
   StickyKeyState state() const { return state_; }
 
   void SetKeyState(StickyKeyState state);
 
  private:
   StickyKeyState state_;
 
   DISALLOW_COPY_AND_ASSIGN(StickyKeyOverlayLabel);
 };
@@ skipping 37 matching lines @@
   SetDisabledColor(label_color);
   SetFontList(font_list().DeriveWithStyle(style));
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 //  StickyKeysOverlayView
 class StickyKeysOverlayView : public views::WidgetDelegateView {
  public:
   StickyKeysOverlayView();
 
-  virtual ~StickyKeysOverlayView();
+  ~StickyKeysOverlayView() override;
 
   // views::WidgetDelegateView overrides:
-  virtual void OnPaint(gfx::Canvas* canvas) override;
+  void OnPaint(gfx::Canvas* canvas) override;
 
   void SetKeyState(ui::EventFlags modifier, StickyKeyState state);
 
   StickyKeyState GetKeyState(ui::EventFlags modifier);
 
   void SetModifierVisible(ui::EventFlags modifier, bool visible);
   bool GetModifierVisible(ui::EventFlags modifier);
 
  private:
   void AddKeyLabel(ui::EventFlags modifier, const std::string& key_label);
@@ skipping 176 matching lines @@
   ui::LayerAnimator* animator = overlay_widget_->GetLayer()->GetAnimator();
   if (animator)
     animator->RemoveObserver(this);
 }
 
 void StickyKeysOverlay::OnLayerAnimationScheduled(
     ui::LayerAnimationSequence* sequence) {
 }
 
 }  // namespace ash