Address regression bug report, revert the PaintInfo rect member function.

Source/core/rendering/RenderListBox.cpp

Index: Source/core/rendering/RenderListBox.cpp
diff --git a/Source/core/rendering/RenderListBox.cpp b/Source/core/rendering/RenderListBox.cpp
index 6f44313cad698e6e614ff10100338a4cf585f9ef..2593e3c91e38e224d7ff266ae4db6dcd5b47e21a 100644
--- a/Source/core/rendering/RenderListBox.cpp
+++ b/Source/core/rendering/RenderListBox.cpp
@@ -357,7 +357,7 @@ void RenderListBox::paintScrollbar(PaintInfo& paintInfo, const LayoutPoint& pain
             m_vBar->width(),
             height() - (borderTop() + borderBottom()));
         m_vBar->setFrameRect(scrollRect);
-        m_vBar->paint(paintInfo.context, paintInfo.rect());
+        m_vBar->paint(paintInfo.context, paintInfo.rect);
     }
 }