Oilpan: Remove Document* pointers in objects

Source/core/rendering/TextAutosizer.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Apple 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 807 matching lines @@
 
         if (i + 1 < clusterInfos.size()) {
             LayoutUnit currentWidth = clusterInfos[i].root->contentLogicalWidth();
             LayoutUnit nextWidth = clusterInfos[i + 1].root->contentLogicalWidth();
             if (currentWidth - nextWidth > maxWidthDifferenceWithinGroup)
                 groups.grow(groups.size() + 1);
         }
     }
 }
 
+void TextAutosizer::trace(Visitor* visitor)
+{
+    visitor->trace(m_document);
+}
+
 } // namespace blink