[Oilpan] Replace raw pointer with UntracedMember

third_party/WebKit/Source/core/frame/LocalFrame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 224 matching lines @@
     // of in the process. This is needed as the plugin element
     // might not itself be attached to a DOM tree and be
     // explicitly detached&disposed of.
     //
     // A weak reference is all wanted; the plugin element must
     // otherwise be referenced and kept alive. So as to be able
     // to process the set of weak references during the LocalFrame's
     // weak callback, the set itself is not on the heap and the
     // references are bare pointers (rather than WeakMembers.)
     // See LocalFrame::clearWeakMembers().
-    GC_PLUGIN_IGNORE("553613")
-    HashSet<HTMLPlugInElement*> m_pluginElements;
+    HashSet<UntracedMember<HTMLPlugInElement>> m_pluginElements;
 #endif
 
     float m_pageZoomFactor;
     float m_textZoomFactor;
 
     bool m_inViewSourceMode;
 
     RefPtrWillBeMember<InstrumentingAgents> m_instrumentingAgents;
 
     // TODO(dcheng): Temporary to try to debug https://crbug.com/531291
@@ skipping 89 matching lines @@
 };
 
 } // namespace blink
 
 // During refactoring, there are some places where we need to do type conversions that
 // will not be needed once all instances of LocalFrame and RemoteFrame are sorted out.
 // At that time this #define will be removed and all the uses of it will need to be corrected.
 #define toLocalFrameTemporary toLocalFrame
 
 #endif // LocalFrame_h