[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/svg/SVGAnimatedNumber.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:
  *
  *     * 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 32 matching lines @@
 class SVGAnimatedNumber : public SVGAnimatedProperty<SVGNumber> {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<SVGAnimatedNumber> create(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtrWillBeRawPtr<SVGNumber> initialValue)
     {
         return adoptRefWillBeNoop(new SVGAnimatedNumber(contextElement, attributeName, initialValue));
     }
 
     void synchronizeAttribute() override;
 
-    void setParentOptionalNumber(SVGAnimatedNumberOptionalNumber* numberOptionalNumber)
-    {
-        m_parentNumberOptionalNumber = numberOptionalNumber;
-    }
+    void setParentOptionalNumber(SVGAnimatedNumberOptionalNumber*);
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     SVGAnimatedNumber(SVGElement* contextElement, const QualifiedName& attributeName, PassRefPtrWillBeRawPtr<SVGNumber> initialValue)
         : SVGAnimatedProperty<SVGNumber>(contextElement, attributeName, initialValue)
         , m_parentNumberOptionalNumber(nullptr)
     {
     }
 
     RawPtrWillBeMember<SVGAnimatedNumberOptionalNumber> m_parentNumberOptionalNumber;
 };
 
 } // namespace blink
 
 #endif // SVGAnimatedNumber_h