[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/events/TreeScopeEventContext.h

 /*
  * Copyright (C) 2014 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 13 matching lines @@
  *
  */
 
 #ifndef TreeScopeEventContext_h
 #define TreeScopeEventContext_h
 
 #include "core/CoreExport.h"
 #include "core/dom/Node.h"
 #include "core/dom/TreeScope.h"
 #include "core/events/EventTarget.h"
+#include "core/events/TouchEventContext.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class EventPath;
 class EventTarget;
 class Node;
 template <typename NodeType> class StaticNodeTypeList;
 using StaticNodeList = StaticNodeTypeList<Node>;
-class TouchEventContext;
 class TreeScope;
 
 class CORE_EXPORT TreeScopeEventContext final : public RefCountedWillBeGarbageCollected<TreeScopeEventContext> {
     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(TreeScopeEventContext);
 public:
     static PassRefPtrWillBeRawPtr<TreeScopeEventContext> create(TreeScope&);
     DECLARE_TRACE();
 
     TreeScope& treeScope() const { return *m_treeScope; }
     Node& rootNode() const { return *m_rootNode; }
@@ skipping 83 matching lines @@
 {
     ASSERT(m_preOrder != -1 && m_postOrder != -1 && other.m_preOrder != -1 && other.m_postOrder != -1);
     return (m_preOrder < other.m_preOrder && m_postOrder < other.m_preOrder)
         || (m_preOrder > other.m_preOrder && m_preOrder > other.m_postOrder);
 }
 #endif
 
 }
 
 #endif // TreeScopeEventContext_h