Remove clips where we can show that they are unnecessary.

Source/core/rendering/RenderListItem.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 374 matching lines @@
 
         if (adjustOverflow) {
             LayoutRect markerRect(markerLogicalLeft + lineOffset, blockOffset, m_marker->width(), m_marker->height());
             if (!style()->isHorizontalWritingMode())
                 markerRect = markerRect.transposedRect();
             RenderBox* o = m_marker;
             bool propagateVisualOverflow = true;
             bool propagateLayoutOverflow = true;
             do {
                 o = o->parentBox();
-                if (o->hasOverflowClip())
-                    propagateVisualOverflow = false;
                 if (o->isRenderBlock()) {
                     if (propagateVisualOverflow)
-                        toRenderBlock(o)->addVisualOverflow(markerRect);
+                        toRenderBlock(o)->addContentsVisualOverflow(markerRect);
                     if (propagateLayoutOverflow)
                         toRenderBlock(o)->addLayoutOverflow(markerRect);
                 }
-                if (o->hasOverflowClip())
+                if (o->hasOverflowClip()) {
                     propagateLayoutOverflow = false;
+                    propagateVisualOverflow = false;
+                }
                 if (o->hasSelfPaintingLayer())
                     propagateVisualOverflow = false;
                 markerRect.moveBy(-o->location());
             } while (o != this && propagateVisualOverflow && propagateLayoutOverflow);
         }
     }
 }
 
 void RenderListItem::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
@@ skipping 90 matching lines @@
             // assume that all the following ones have too.
             // This gives us the opportunity to stop here and avoid
             // marking the same nodes again.
             break;
         }
         item->updateValue();
     }
 }
 
 } // namespace WebCore