Oilpan: fix build after r197938.

Source/core/html/canvas/CanvasRenderingContext2DState.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 CanvasRenderingContext2DState_h
 #define CanvasRenderingContext2DState_h
 
 #include "core/css/CSSFontSelectorClient.h"
 #include "core/html/canvas/ClipList.h"
 #include "platform/fonts/Font.h"
@@ skipping 182 matching lines @@
 
     float m_globalAlpha;
     AffineTransform m_transform;
     Vector<float> m_lineDash;
     float m_lineDashOffset;
 
     String m_unparsedFont;
     Font m_font;
 
     String m_unparsedFilter;
-    RefPtrWillBeRawPtr<CSSValue> m_filterValue;
+    RefPtrWillBeMember<CSSValue> m_filterValue;
     mutable RefPtr<SkImageFilter> m_resolvedFilter;
 
     // Text state.
     TextAlign m_textAlign;
     TextBaseline m_textBaseline;
     Direction m_direction;
 
     bool m_realizedFont : 1;
     bool m_isTransformInvertible : 1;
     bool m_hasClip : 1;
     bool m_hasComplexClip : 1;
     mutable bool m_fillStyleDirty : 1;
     mutable bool m_strokeStyleDirty : 1;
     mutable bool m_lineDashDirty : 1;
 
     ClipList m_clipList;
 };
 
 } // blink
 
 #endif