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

Source/core/rendering/RenderListBox.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  *               2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 339 matching lines @@
 }
 
 void RenderListBox::paintScrollbar(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     if (m_vBar) {
         IntRect scrollRect = pixelSnappedIntRect(paintOffset.x() + width() - borderRight() - m_vBar->width(),
             paintOffset.y() + borderTop(),
             m_vBar->width(),
             height() - (borderTop() + borderBottom()));
         m_vBar->setFrameRect(scrollRect);
-        m_vBar->paint(paintInfo.context, paintInfo.rect());
+        m_vBar->paint(paintInfo.context, paintInfo.rect);
     }
 }
 
 static LayoutSize itemOffsetForAlignment(TextRun textRun, RenderStyle* itemStyle, Font itemFont, LayoutRect itemBoudingBox)
 {
     ETextAlign actualAlignment = itemStyle->textAlign();
     // FIXME: Firefox doesn't respect JUSTIFY. Should we?
     // FIXME: Handle TAEND here
     if (actualAlignment == TASTART || actualAlignment == JUSTIFY)
       actualAlignment = itemStyle->isLeftToRightDirection() ? LEFT : RIGHT;
@@ skipping 536 matching lines @@
 
     if (m_vBar)
         m_vBar->styleChanged();
 
     // Force an update since we know the scrollbars have changed things.
     if (document()->hasAnnotatedRegions())
         document()->setAnnotatedRegionsDirty(true);
 }
 
 } // namespace WebCore