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

Source/core/rendering/RenderBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2792 matching lines @@
 TextRun RenderBlockFlow::constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
 {
     bool hasStrongDirectionality;
     return constructTextRun(context, font, string, style,
         determineDirectionality(string, hasStrongDirectionality),
         expansion, flags);
 }
 
 RootInlineBox* RenderBlockFlow::createRootInlineBox()
 {
-    return new RootInlineBox(this);
+    return new RootInlineBox(*this);
 }
 
 void RenderBlockFlow::createMultiColumnFlowThreadIfNeeded()
 {
     if ((style()->hasAutoColumnCount() && style()->hasAutoColumnWidth()) || !document().regionBasedColumnsEnabled())
         return;
 
     if (multiColumnFlowThread())
         return;
 
     setChildrenInline(false);
     RenderMultiColumnFlowThread* flowThread = RenderMultiColumnFlowThread::createAnonymous(document(), style());
     RenderBlock::addChild(flowThread);
     RenderBlockFlowRareData& rareData = ensureRareData();
     ASSERT(!rareData.m_multiColumnFlowThread);
     rareData.m_multiColumnFlowThread = flowThread;
 }
 
 RenderBlockFlow::RenderBlockFlowRareData& RenderBlockFlow::ensureRareData()
 {
     if (m_rareData)
         return *m_rareData;
 
     m_rareData = adoptPtr(new RenderBlockFlowRareData(this));
     return *m_rareData;
 }
 
 } // namespace WebCore