Oilpan: Prepare to move RenderObject and RenderObjectChildList to Oilpan heap.

Source/core/rendering/RenderQuote.cpp

 /**
  * Copyright (C) 2011 Nokia Inc.  All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 17 matching lines @@
 #include "wtf/text/AtomicString.h"
 
 #include <algorithm>
 
 namespace blink {
 
 RenderQuote::RenderQuote(Document* node, QuoteType quote)
     : RenderInline(0)
     , m_type(quote)
     , m_depth(0)
-    , m_next(0)
-    , m_previous(0)
+    , m_next(nullptr)
+    , m_previous(nullptr)
     , m_attached(false)
 {
     setDocumentForAnonymous(node);
 }
 
 RenderQuote::~RenderQuote()
 {
     ASSERT(!m_attached);
     ASSERT(!m_next && !m_previous);
 }
 
+void RenderQuote::trace(Visitor* visitor)
+{
+    visitor->trace(m_next);
+    visitor->trace(m_previous);
+    RenderInline::trace(visitor);
+}
+
 void RenderQuote::willBeDestroyed()
 {
     detachQuote();
     RenderInline::willBeDestroyed();
 }
 
 void RenderQuote::willBeRemovedFromTree()
 {
     RenderInline::willBeRemovedFromTree();
     detachQuote();
@@ skipping 289 matching lines @@
         m_previous->m_next = m_next;
     else if (view())
         view()->setRenderQuoteHead(m_next);
     if (m_next)
         m_next->m_previous = m_previous;
     if (!documentBeingDestroyed()) {
         for (RenderQuote* quote = m_next; quote; quote = quote->m_next)
             quote->updateDepth();
     }
     m_attached = false;
-    m_next = 0;
-    m_previous = 0;
+    m_next = nullptr;
+    m_previous = nullptr;
     m_depth = 0;
 }
 
 void RenderQuote::updateDepth()
 {
     ASSERT(m_attached);
     int oldDepth = m_depth;
     m_depth = 0;
     if (m_previous) {
         m_depth = m_previous->m_depth;
         switch (m_previous->m_type) {
         case OPEN_QUOTE:
         case NO_OPEN_QUOTE:
             m_depth++;
             break;
         case CLOSE_QUOTE:
         case NO_CLOSE_QUOTE:
             if (m_depth)
                 m_depth--;
             break;
         }
     }
     if (oldDepth != m_depth)
         updateText();
 }
 
 } // namespace blink