Move and rename RenderPart to LayoutPart.

Source/core/paint/PartPainter.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PartPainter_h
 #define PartPainter_h
 
 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
 
 #endif // PartPainter_h