[Oilpan] Replace a raw pointer with UntracedMember in RetainedDOMInfo

third_party/WebKit/Source/bindings/core/v8/RetainedDOMInfo.cpp

 /*
  * Copyright (C) 2011 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 81 matching lines @@
     intptr_t count = 1;
     for (Node& current : NodeTraversal::descendantsOf(*m_root)) {
         ALLOW_UNUSED_LOCAL(current);
         ++count;
     }
     return count;
 }
 
 intptr_t RetainedDOMInfo::GetEquivalenceClass()
 {
-    return reinterpret_cast<intptr_t>(m_root);
+    return reinterpret_cast<intptr_t>(m_root.get());
 }
 
 ActiveDOMObjectsInfo::ActiveDOMObjectsInfo(int numberOfObjectsWithPendingActivity)
     : m_numberOfObjectsWithPendingActivity(numberOfObjectsWithPendingActivity)
 {
 }
 
 ActiveDOMObjectsInfo::~ActiveDOMObjectsInfo()
 {
 }
@@ skipping 27 matching lines @@
 {
     return m_numberOfObjectsWithPendingActivity;
 }
 
 intptr_t ActiveDOMObjectsInfo::GetEquivalenceClass()
 {
     return reinterpret_cast<intptr_t>(this);
 }
 
 } // namespace blink