Update SVG classes to use OVERRIDE / FINAL when needed

Source/core/svg/SVGFontFaceSrcElement.h

Index: Source/core/svg/SVGFontFaceSrcElement.h
diff --git a/Source/core/svg/SVGFontFaceSrcElement.h b/Source/core/svg/SVGFontFaceSrcElement.h
index f7ef1af6f6b2bc4a0a203ac54294082f9334b8a7..d96ce11e4a0f952cda6e2ee4caa24b7c32efa57d 100644
--- a/Source/core/svg/SVGFontFaceSrcElement.h
+++ b/Source/core/svg/SVGFontFaceSrcElement.h
@@ -36,7 +36,7 @@ public:
 private:
     explicit SVGFontFaceSrcElement(Document&);
 
-    virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
+    virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0) OVERRIDE;
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
 };