[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/loader/FormSubmission.h

 /*
  * Copyright (C) 2010 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef FormSubmission_h
 #define FormSubmission_h
 
+#include "core/events/Event.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/Referrer.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class EncodedFormData;
-class Event;
 struct FrameLoadRequest;
 class HTMLFormElement;
 
 class FormSubmission : public RefCountedWillBeGarbageCollectedFinalized<FormSubmission> {
 public:
     enum Method { GetMethod, PostMethod, DialogMethod };
 
     class Attributes {
         DISALLOW_NEW();
         WTF_MAKE_NONCOPYABLE(Attributes);
@@ skipping 66 matching lines @@
     RefPtrWillBeMember<HTMLFormElement> m_form;
     RefPtr<EncodedFormData> m_formData;
     String m_boundary;
     RefPtrWillBeMember<Event> m_event;
     String m_result;
 };
 
 }
 
 #endif // FormSubmission_h