Fix virtual/override/final usage in Source/web/.

Source/web/NotificationPermissionClientImpl.h

Index: Source/web/NotificationPermissionClientImpl.h
diff --git a/Source/web/NotificationPermissionClientImpl.h b/Source/web/NotificationPermissionClientImpl.h
index 74eb37676a06e5505f28016673978bfc292e8b07..80674f7c4f3e7d04cee6fe91d0fbd7294e308814 100644
--- a/Source/web/NotificationPermissionClientImpl.h
+++ b/Source/web/NotificationPermissionClientImpl.h
@@ -14,10 +14,10 @@ class NotificationPermissionClientImpl : public NoBaseWillBeGarbageCollectedFina
 public:
     static PassOwnPtrWillBeRawPtr<NotificationPermissionClientImpl> create();
 
-    virtual ~NotificationPermissionClientImpl();
+    ~NotificationPermissionClientImpl() override;
 
     // NotificationPermissionClient implementation.
-    virtual void requestPermission(ExecutionContext*, NotificationPermissionCallback*) override;
+    void requestPermission(ExecutionContext*, NotificationPermissionCallback*) override;
 
     // NoBaseWillBeGarbageCollectedFinalized implementation.
     DEFINE_INLINE_VIRTUAL_TRACE() { NotificationPermissionClient::trace(visitor); }