Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderRuby.h

Index: Source/core/rendering/RenderRuby.h
diff --git a/Source/core/rendering/RenderRuby.h b/Source/core/rendering/RenderRuby.h
index 2494639f9a54b696b323d775ca325a811556de44..4073653cb0ad10f2dc80187efabe2b7f90c4f77f 100644
--- a/Source/core/rendering/RenderRuby.h
+++ b/Source/core/rendering/RenderRuby.h
@@ -51,7 +51,7 @@ namespace WebCore {
 // Generated :before/:after content is shunted into anonymous inline blocks
 
 // <ruby> when used as 'display:inline'
-class RenderRubyAsInline : public RenderInline {
+class RenderRubyAsInline FINAL : public RenderInline {
 public:
     RenderRubyAsInline(Element*);
     virtual ~RenderRubyAsInline();
@@ -70,7 +70,7 @@ private:
 };
 
 // <ruby> when used as 'display:block' or 'display:inline-block'
-class RenderRubyAsBlock : public RenderBlock {
+class RenderRubyAsBlock FINAL : public RenderBlock {
 public:
     RenderRubyAsBlock(Element*);
     virtual ~RenderRubyAsBlock();