Oilpan: move RenderObjects off heap.

Source/core/rendering/RenderVTTCue.cpp

 /*
  * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
  *
  * 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 20 matching lines @@
 #include "core/rendering/RenderInline.h"
 
 namespace blink {
 
 RenderVTTCue::RenderVTTCue(VTTCueBox* element)
     : RenderBlockFlow(element)
     , m_cue(element->getCue())
 {
 }
 
-void RenderVTTCue::trace(Visitor* visitor)
-{
-    visitor->trace(m_cue);
-    RenderBlockFlow::trace(visitor);
-}
-
 class SnapToLinesLayouter {
     STACK_ALLOCATED();
 public:
     SnapToLinesLayouter(RenderVTTCue& cueBox, float linePosition)
         : m_cueBox(cueBox)
         , m_linePosition(linePosition)
     {
     }
 
     void layout();
@@ skipping 271 matching lines @@
         SnapToLinesLayouter(*this, m_cue->calculateComputedLinePosition()).layout();
 
         adjustForTopAndBottomMarginBorderAndPadding();
     } else {
         repositionCueSnapToLinesNotSet();
     }
 }
 
 } // namespace blink