Rename rendering/RenderScrollbar* to layout/LayoutScrollbar*

public/platform/WebScrollbarThemePainter.h

Index: public/platform/WebScrollbarThemePainter.h
diff --git a/public/platform/WebScrollbarThemePainter.h b/public/platform/WebScrollbarThemePainter.h
index ca6c8b5b883404bbf9f4928cb1eb28959b63f73a..c8d23b60c8f918f23e6d4669a7308ef563b40b12 100644
--- a/public/platform/WebScrollbarThemePainter.h
+++ b/public/platform/WebScrollbarThemePainter.h
@@ -73,7 +73,7 @@ private:
     // It is assumed that the constructor of this paint object is responsible
     // for the lifetime of this scrollbar. The painter has to use the real
     // scrollbar (and not a WebScrollbar wrapper) due to static_casts for
-    // RenderScrollbar and pointer-based HashMap lookups for Lion scrollbars.
+    // LayoutScrollbar and pointer-based HashMap lookups for Lion scrollbars.
     Scrollbar* m_scrollbar;
 };