Move and rename RenderPart to LayoutPart.

Source/core/paint/PartPainter.h

Index: Source/core/paint/PartPainter.h
diff --git a/Source/core/paint/PartPainter.h b/Source/core/paint/PartPainter.h
index 9896d7d7351a3eae7136e262d40696e6f05eaad2..c1276c20ae330c64b111acc8783bd2cf43316a21 100644
--- a/Source/core/paint/PartPainter.h
+++ b/Source/core/paint/PartPainter.h
@@ -9,17 +9,17 @@ namespace blink {
 
 struct PaintInfo;
 class LayoutPoint;
-class RenderPart;
+class LayoutPart;
 
 class PartPainter {
 public:
-    PartPainter(RenderPart& renderPart) : m_renderPart(renderPart) { }
+    PartPainter(LayoutPart& layoutPart) : m_layoutPart(layoutPart) { }
 
     void paint(const PaintInfo&, const LayoutPoint&);
     void paintContents(const PaintInfo&, const LayoutPoint&);
 
 private:
-    RenderPart& m_renderPart;
+    LayoutPart& m_layoutPart;
 };
 
 } // namespace blink