[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/animation/InterpolationEnvironment.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InterpolationEnvironment_h
 #define InterpolationEnvironment_h
 
+#include "core/svg/SVGElement.h"
+#include "core/svg/properties/SVGProperty.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class StyleResolverState;
-class SVGPropertyBase;
-class SVGElement;
 
 class InterpolationEnvironment {
     STACK_ALLOCATED();
 public:
     explicit InterpolationEnvironment(StyleResolverState& state)
         : m_state(&state)
         , m_svgElement(nullptr)
         , m_svgBaseValue(nullptr)
     { }
 
@@ skipping 13 matching lines @@
 
 private:
     StyleResolverState* m_state;
     RawPtrWillBeMember<SVGElement> m_svgElement;
     RawPtrWillBeMember<const SVGPropertyBase> m_svgBaseValue;
 };
 
 } // namespace blink
 
 #endif // InterpolationEnvironment_h