Oilpan: fix build after r356804.

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 "platform/heap/Handle.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class StyleResolverState;
 class SVGPropertyBase;
 class SVGElement;
 
 class InterpolationEnvironment {
     STACK_ALLOCATED();
@@ skipping 13 matching lines @@
     StyleResolverState& state() { ASSERT(m_state); return *m_state; }
     const StyleResolverState& state() const { ASSERT(m_state); return *m_state; }
 
     SVGElement& svgElement() { ASSERT(m_svgElement); return *m_svgElement; }
     const SVGElement& svgElement() const { ASSERT(m_svgElement); return *m_svgElement; }
 
     const SVGPropertyBase& svgBaseValue() const { ASSERT(m_svgBaseValue); return *m_svgBaseValue; }
 
 private:
     StyleResolverState* m_state;
-    SVGElement* m_svgElement;
-    const SVGPropertyBase* m_svgBaseValue;
+    RawPtrWillBeMember<SVGElement> m_svgElement;
+    RawPtrWillBeMember<const SVGPropertyBase> m_svgBaseValue;
 };
 
 } // namespace blink
 
 #endif // InterpolationEnvironment_h