Move paint code for RenderScrollbar and RenderScrollbarPart into ScrollbarPainter.

Source/core/rendering/RenderScrollbar.cpp

Index: Source/core/rendering/RenderScrollbar.cpp
diff --git a/Source/core/rendering/RenderScrollbar.cpp b/Source/core/rendering/RenderScrollbar.cpp
index 05520a317f4ef3ba992b7781ab845b2713c62f91..34e5998a3565ebdce0dba4d1ccf80b018ed67d0e 100644
--- a/Source/core/rendering/RenderScrollbar.cpp
+++ b/Source/core/rendering/RenderScrollbar.cpp
@@ -256,14 +256,6 @@ void RenderScrollbar::updateScrollbarPart(ScrollbarPart partType, bool destroy)
         partRenderer->setStyle(partStyle.release());
 }
 
-void RenderScrollbar::paintPart(GraphicsContext* graphicsContext, ScrollbarPart partType, const IntRect& rect)
-{
-    RenderScrollbarPart* partRenderer = m_parts.get(partType);
-    if (!partRenderer)
-        return;
-    partRenderer->paintIntoRect(graphicsContext, location(), rect);
-}
-
 IntRect RenderScrollbar::buttonRect(ScrollbarPart partType)
 {
     RenderScrollbarPart* partRenderer = m_parts.get(partType);