Make InlineBox::renderer() and related subclass methods return reference.

Source/core/rendering/RenderListMarker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2010 Daniel Bates (dbates@intudata.com)
  *
  * 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
@@ skipping 1099 matching lines @@
 {
     return m_image && !m_image->errorOccurred();
 }
 
 LayoutRect RenderListMarker::localSelectionRect()
 {
     InlineBox* box = inlineBoxWrapper();
     if (!box)
         return LayoutRect(LayoutPoint(), size());
     RootInlineBox* root = inlineBoxWrapper()->root();
-    LayoutUnit newLogicalTop = root->block()->style()->isFlippedBlocksWritingMode() ? inlineBoxWrapper()->logicalBottom() - root->selectionBottom() : root->selectionTop() - inlineBoxWrapper()->logicalTop();
-    if (root->block()->style()->isHorizontalWritingMode())
+    LayoutUnit newLogicalTop = root->block().style()->isFlippedBlocksWritingMode() ? inlineBoxWrapper()->logicalBottom() - root->selectionBottom() : root->selectionTop() - inlineBoxWrapper()->logicalTop();
+    if (root->block().style()->isHorizontalWritingMode())
         return LayoutRect(0, newLogicalTop, width(), root->selectionHeight());
     return LayoutRect(newLogicalTop, 0, root->selectionHeight(), height());
 }
 
 void RenderListMarker::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     ANNOTATE_GRAPHICS_CONTEXT(paintInfo, this);
 
     if (paintInfo.phase != PaintPhaseForeground)
         return;
@@ skipping 709 matching lines @@
 
     if (clipToVisibleContent)
         computeRectForRepaint(repaintContainer, rect);
     else
         rect = localToContainerQuad(FloatRect(rect), repaintContainer).enclosingBoundingBox();
 
     return rect;
 }
 
 } // namespace WebCore