Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/views/accessibility/accessibility_event_router_views.h

Index: chrome/browser/ui/views/accessibility/accessibility_event_router_views.h
diff --git a/chrome/browser/ui/views/accessibility/accessibility_event_router_views.h b/chrome/browser/ui/views/accessibility/accessibility_event_router_views.h
index 2480787df9cf32a36e57928210a767700c7e2b41..ab70f567a7a941c2c0810afab7739c5989ad2e11 100644
--- a/chrome/browser/ui/views/accessibility/accessibility_event_router_views.h
+++ b/chrome/browser/ui/views/accessibility/accessibility_event_router_views.h
@@ -56,9 +56,9 @@ class AccessibilityEventRouterViews : public content::NotificationObserver {
                              bool has_submenu);
 
   // NotificationObserver implementation.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
  private:
   friend struct DefaultSingletonTraits<AccessibilityEventRouterViews>;
@@ -71,7 +71,7 @@ class AccessibilityEventRouterViews : public content::NotificationObserver {
                            AccessibilityFocusableView);
 
   AccessibilityEventRouterViews();
-  virtual ~AccessibilityEventRouterViews();
+  ~AccessibilityEventRouterViews() override;
 
   // Call DispatchAccessibilityEvent using a view storage id.
   static void DispatchEventOnViewStorageId(