Rename renderer() to layoutObject().

Source/core/layout/LayoutScrollbar.cpp

 /*
  * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 75 matching lines @@
     visitor->trace(m_owner);
     visitor->trace(m_owningFrame);
 #endif
     Scrollbar::trace(visitor);
 }
 
 LayoutBox* LayoutScrollbar::owningRenderer() const
 {
     if (m_owningFrame)
         return m_owningFrame->ownerLayoutObject();
-    return m_owner && m_owner->renderer() ? m_owner->renderer()->enclosingBox() : 0;
+    return m_owner && m_owner->layoutObject() ? m_owner->layoutObject()->enclosingBox() : 0;
 }
 
 void LayoutScrollbar::setParent(Widget* parent)
 {
     Scrollbar::setParent(parent);
     if (!parent) {
         // Destroy all of the scrollbar's LayoutBoxes.
         updateScrollbarParts(true);
     }
 }
@@ skipping 239 matching lines @@
 int LayoutScrollbar::minimumThumbLength()
 {
     LayoutScrollbarPart* partRenderer = m_parts.get(ThumbPart);
     if (!partRenderer)
         return 0;
     partRenderer->layout();
     return orientation() == HorizontalScrollbar ? partRenderer->size().width() : partRenderer->size().height();
 }
 
 }