[Oilpan] Create UnsafePtr to store on-heap pointers in Vector

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 803 matching lines @@
 }
 
 void LocalFrame::unregisterPluginElement(HTMLPlugInElement* plugin)
 {
     ASSERT(m_pluginElements.contains(plugin));
     m_pluginElements.remove(plugin);
 }
 
 void LocalFrame::clearWeakMembers(Visitor* visitor)
 {
-    Vector<HTMLPlugInElement*> deadPlugins;
+    Vector<UntracedMember<HTMLPlugInElement>> deadPlugins;
     for (const auto& pluginElement : m_pluginElements) {
         if (!Heap::isHeapObjectAlive(pluginElement)) {
             pluginElement->shouldDisposePlugin();
             deadPlugins.append(pluginElement);
         }
     }
     for (unsigned i = 0; i < deadPlugins.size(); ++i)
         m_pluginElements.remove(deadPlugins[i]);
 }
 #endif
@@ skipping 42 matching lines @@
     if (!context)
         return;
 
     WebSecurityOrigin securityOrigin(context->securityOrigin());
     frameScheduler()->setFrameOrigin(&securityOrigin);
 }
 
 DEFINE_WEAK_IDENTIFIER_MAP(LocalFrame);
 
 } // namespace blink