Move rendering/RenderGrid to layout/LayoutGrid

Source/core/paint/GridPainter.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 GridPainter_h
 #define GridPainter_h
 
 namespace blink {
 
 struct PaintInfo;
 class LayoutPoint;
 class LayoutBox;
-class RenderGrid;
+class LayoutGrid;
 
 class GridPainter {
 public:
-    GridPainter(RenderGrid& renderGrid) : m_renderGrid(renderGrid) { }
+    GridPainter(LayoutGrid& layoutGrid) : m_layoutGrid(layoutGrid) { }
 
     void paintChildren(const PaintInfo&, const LayoutPoint&);
 
 private:
-    RenderGrid& m_renderGrid;
+    LayoutGrid& m_layoutGrid;
 };
 
 } // namespace blink
 
 #endif // GridPainter_h