Fix virtual/override/final usage in Source/core/layout/.

Source/core/layout/LayoutFullScreen.cpp

Index: Source/core/layout/LayoutFullScreen.cpp
diff --git a/Source/core/layout/LayoutFullScreen.cpp b/Source/core/layout/LayoutFullScreen.cpp
index d23f7ee932b69abcea90078df0d6df98edab4bf3..917d64c197586b5e4f69e3e1fa0a0fc5255dd3c2 100644
--- a/Source/core/layout/LayoutFullScreen.cpp
+++ b/Source/core/layout/LayoutFullScreen.cpp
@@ -44,8 +44,8 @@ public:
         setDocumentForAnonymous(&owner->document());
     }
 private:
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutFullScreenPlaceholder || LayoutBlockFlow::isOfType(type); }
-    virtual void willBeDestroyed() override;
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutFullScreenPlaceholder || LayoutBlockFlow::isOfType(type); }
+    void willBeDestroyed() override;
     LayoutFullScreen* m_owner;
 };