Oilpan: move BaseChooserOnlyDateAndTimeInputType to the heap.

third_party/WebKit/Source/web/ExternalDateTimeChooser.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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 22 matching lines @@
 
 class ChromeClientImpl;
 class DateTimeChooserClient;
 class WebString;
 class WebViewClient;
 
 class ExternalDateTimeChooser final : public DateTimeChooser {
 public:
     static PassRefPtrWillBeRawPtr<ExternalDateTimeChooser> create(ChromeClientImpl*, WebViewClient*, DateTimeChooserClient*, const DateTimeChooserParameters&);
     ~ExternalDateTimeChooser() override;
+    DECLARE_VIRTUAL_TRACE();
 
     // The following functions are for DateTimeChooserCompletion.
     void didChooseValue(const WebString&);
     void didChooseValue(double);
     void didCancelChooser();
 
 private:
     ExternalDateTimeChooser(DateTimeChooserClient*);
     bool openDateTimeChooser(ChromeClientImpl*, WebViewClient*, const DateTimeChooserParameters&);
 
     // DateTimeChooser function:
     void endChooser() override;
     AXObject* rootAXObject() override;
 
-    DateTimeChooserClient* m_client;
+    RawPtrWillBeMember<DateTimeChooserClient> m_client;
 };
 
 }
 #endif
 
 #endif