Oilpan: Prepare to move PickerIndicatorElement to Oilpan heap.

Source/core/html/shadow/PickerIndicatorElement.h

 /*
  * Copyright (C) 2012 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 27 matching lines @@
 
 namespace WebCore {
 
 class HTMLInputElement;
 class PagePopup;
 
 class PickerIndicatorElement FINAL : public HTMLDivElement, public DateTimeChooserClient {
 public:
     // PickerIndicatorOwner implementer must call removePickerIndicatorOwner when
     // it doesn't handle event, e.g. at destruction.
-    class PickerIndicatorOwner {
+    class PickerIndicatorOwner : public WillBeGarbageCollectedMixin {
     public:
         virtual ~PickerIndicatorOwner() { }
         virtual bool isPickerIndicatorOwnerDisabledOrReadOnly() const = 0;
         // FIXME: Remove. Deprecated in favor of double version.
         virtual void pickerIndicatorChooseValue(const String&) = 0;
         virtual void pickerIndicatorChooseValue(double) = 0;
         virtual bool setupDateTimeChooserParameters(DateTimeChooserParameters&) = 0;
     };
 
-    static PassRefPtr<PickerIndicatorElement> create(Document&, PickerIndicatorOwner&);
+    static PassRefPtrWillBeRawPtr<PickerIndicatorElement> create(Document&, PickerIndicatorOwner&);
     virtual ~PickerIndicatorElement();
+    virtual void trace(Visitor*) OVERRIDE;
+
     void openPopup();
     void closePopup();
     virtual bool willRespondToMouseClickEvents() OVERRIDE;
-    void removePickerIndicatorOwner() { m_pickerIndicatorOwner = 0; }
+    void removePickerIndicatorOwner() { m_pickerIndicatorOwner = nullptr; }
 
     // DateTimeChooserClient implementation.
     virtual void didChooseValue(const String&) OVERRIDE;
     virtual void didChooseValue(double) OVERRIDE;
     virtual void didEndChooser() OVERRIDE;
 
 private:
     PickerIndicatorElement(Document&, PickerIndicatorOwner&);
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
     virtual void defaultEventHandler(Event*) OVERRIDE;
     virtual void detach(const AttachContext& = AttachContext()) OVERRIDE;
     virtual bool isPickerIndicatorElement() const OVERRIDE;
 
     HTMLInputElement* hostInput();
 
-    PickerIndicatorOwner* m_pickerIndicatorOwner;
+    RawPtrWillBeMember<PickerIndicatorOwner> m_pickerIndicatorOwner;
     RefPtr<DateTimeChooser> m_chooser;
 };
 
 DEFINE_TYPE_CASTS(PickerIndicatorElement, Element, element, element->isPickerIndicatorElement(), element.isPickerIndicatorElement());
 
 }
 #endif
 #endif