Move Shadow DOM renderers into rendering/

Source/core/html/shadow/SliderThumbElement.h

Index: Source/core/html/shadow/SliderThumbElement.h
diff --git a/Source/core/html/shadow/SliderThumbElement.h b/Source/core/html/shadow/SliderThumbElement.h
index efb41d65fa08796493c93c09d0a5ca5f59b592e9..bae0e7db94c43801360da08dd6e078e9bbbf2049 100644
--- a/Source/core/html/shadow/SliderThumbElement.h
+++ b/Source/core/html/shadow/SliderThumbElement.h
@@ -81,19 +81,6 @@ inline PassRefPtrWillBeRawPtr<Element> SliderThumbElement::cloneElementWithoutAt
 // FIXME: There are no ways to check if a node is a SliderThumbElement.
 DEFINE_ELEMENT_TYPE_CASTS(SliderThumbElement, isHTMLElement());
 
-// --------------------------------
-
-class RenderSliderThumb FINAL : public RenderBlockFlow {
-public:
-    RenderSliderThumb(SliderThumbElement*);
-    void updateAppearance(RenderStyle* parentStyle);
-
-private:
-    virtual bool isSliderThumb() const OVERRIDE;
-};
-
-// --------------------------------
-
 class SliderContainerElement FINAL : public HTMLDivElement {
 public:
     DECLARE_NODE_FACTORY(SliderContainerElement);