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

Source/core/layout/LayoutCounter.h

Index: Source/core/layout/LayoutCounter.h
diff --git a/Source/core/layout/LayoutCounter.h b/Source/core/layout/LayoutCounter.h
index 28b1873bad4b32f0f6bf011af6a0d2c2d9370ec9..abbe300b256cd34174bd157177a20a7b22a9948d 100644
--- a/Source/core/layout/LayoutCounter.h
+++ b/Source/core/layout/LayoutCounter.h
@@ -32,7 +32,7 @@ class CounterNode;
 class LayoutCounter final : public LayoutText {
 public:
     LayoutCounter(Document*, const CounterContent&);
-    virtual ~LayoutCounter();
+    ~LayoutCounter() override;
 
     static void destroyCounterNodes(LayoutObject&);
     static void destroyCounterNode(LayoutObject&, const AtomicString& identifier);
@@ -42,14 +42,14 @@ public:
 
     void updateCounter();
 
-    virtual const char* name() const override { return "LayoutCounter"; }
+    const char* name() const override { return "LayoutCounter"; }
 
 protected:
-    virtual void willBeDestroyed() override;
+    void willBeDestroyed() override;
 
 private:
-    virtual bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectCounter || LayoutText::isOfType(type); }
-    virtual PassRefPtr<StringImpl> originalText() const override;
+    bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectCounter || LayoutText::isOfType(type); }
+    PassRefPtr<StringImpl> originalText() const override;
 
     // Removes the reference to the CounterNode associated with this layoutObject.
     // This is used to cause a counter display update when the CounterNode tree changes.