Oilpan: have Navigator plugin objects on the heap by default.

Source/modules/plugins/DOMPlugin.h

 /*
     Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 
     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,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Library General Public License for more details.
 
     You should have received a copy of the GNU Library General Public License
     along with this library; see the file COPYING.LIB.  If not, write to
     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
 */
 
 #ifndef DOMPlugin_h
 #define DOMPlugin_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/frame/LocalFrameLifecycleObserver.h"
 #include "modules/plugins/DOMMimeType.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
-#include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class PluginData;
 
-class DOMPlugin final : public RefCountedWillBeGarbageCollectedFinalized<DOMPlugin>, public ScriptWrappable, public LocalFrameLifecycleObserver {
+class DOMPlugin final : public GarbageCollectedFinalized<DOMPlugin>, public ScriptWrappable, public LocalFrameLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMPlugin);
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<DOMPlugin> create(PluginData* pluginData, LocalFrame* frame, unsigned index)
+    static DOMPlugin* create(PluginData* pluginData, LocalFrame* frame, unsigned index)
     {
-        return adoptRefWillBeNoop(new DOMPlugin(pluginData, frame, index));
+        return new DOMPlugin(pluginData, frame, index);
     }
     virtual ~DOMPlugin();
 
     String name() const;
     String filename() const;
     String description() const;
 
     unsigned length() const;
 
-    PassRefPtrWillBeRawPtr<DOMMimeType> item(unsigned index);
-    PassRefPtrWillBeRawPtr<DOMMimeType> namedItem(const AtomicString& propertyName);
+    DOMMimeType* item(unsigned index);
+    DOMMimeType* namedItem(const AtomicString& propertyName);
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     DOMPlugin(PluginData*, LocalFrame*, unsigned index);
 
     const PluginInfo& pluginInfo() const { return m_pluginData->plugins()[m_index]; }
 
     RefPtr<PluginData> m_pluginData;
     unsigned m_index;
 };
 
 } // namespace blink
 
 #endif // DOMPlugin_h