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

Source/core/dom/DOMDataView.cpp

Index: Source/core/dom/DOMDataView.cpp
diff --git a/Source/core/dom/DOMDataView.cpp b/Source/core/dom/DOMDataView.cpp
index 9e7b0531ec7c6e2df96014e62c26bde6bd4b14f3..f8d795c964a7c4459babcd44d3447f37e82a0983 100644
--- a/Source/core/dom/DOMDataView.cpp
+++ b/Source/core/dom/DOMDataView.cpp
@@ -28,11 +28,11 @@ public:
         return adoptRef(new DataView(buffer, byteOffset, byteLength));
     }
 
-    virtual unsigned byteLength() const override { return m_byteLength; }
-    virtual ViewType type() const override { return TypeDataView; }
+    unsigned byteLength() const override { return m_byteLength; }
+    ViewType type() const override { return TypeDataView; }
 
 protected:
-    virtual void neuter() override
+    void neuter() override
     {
         ArrayBufferView::neuter();
         m_byteLength = 0;