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

Source/modules/plugins/DOMMimeType.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 DOMMimeType_h
 #define DOMMimeType_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/frame/LocalFrameLifecycleObserver.h"
 #include "platform/heap/Handle.h"
 #include "platform/plugins/PluginData.h"
 #include "wtf/Forward.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class DOMPlugin;
 class LocalFrame;
 
-class DOMMimeType final : public RefCountedWillBeGarbageCollectedFinalized<DOMMimeType>, public ScriptWrappable, public LocalFrameLifecycleObserver {
+class DOMMimeType final : public GarbageCollectedFinalized<DOMMimeType>, public ScriptWrappable, public LocalFrameLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMMimeType);
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static PassRefPtrWillBeRawPtr<DOMMimeType> create(PassRefPtr<PluginData> pluginData, LocalFrame* frame, unsigned index)
+    static DOMMimeType* create(PassRefPtr<PluginData> pluginData, LocalFrame* frame, unsigned index)
     {
-        return adoptRefWillBeNoop(new DOMMimeType(pluginData, frame, index));
+        return new DOMMimeType(pluginData, frame, index);
     }
     virtual ~DOMMimeType();
 
     const String& type() const;
     String suffixes() const;
     const String& description() const;
-    PassRefPtrWillBeRawPtr<DOMPlugin> enabledPlugin() const;
+    DOMPlugin* enabledPlugin() const;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     DOMMimeType(PassRefPtr<PluginData>, LocalFrame*, unsigned index);
 
     const MimeClassInfo& mimeClassInfo() const { return m_pluginData->mimes()[m_index]; }
 
     RefPtr<PluginData> m_pluginData;
     unsigned m_index;
 };
 
 } // namespace blink
 
 #endif // DOMMimeType_h