Oilpan: Validate pointers stored in Member

Source/core/paint/SVGPaintContext.h

 /**
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2012 Zoltan Herczeg <zherczeg@webkit.org>.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 69 matching lines @@
     bool applyMaskIfNecessary(SVGResources*);
 
     // Return true if no filtering is necessary or if the filter is successfully applied.
     bool applyFilterIfNecessary(SVGResources*);
 
     bool isIsolationInstalled() const;
 
     LayoutObject* m_object;
     PaintInfo m_paintInfo;
     const PaintInfo* m_originalPaintInfo;
-    RawPtrWillBeMember<LayoutSVGResourceFilter> m_filter;
-    RawPtrWillBeMember<LayoutSVGResourceClipper> m_clipper;
+    LayoutSVGResourceFilter* m_filter;
+    LayoutSVGResourceClipper* m_clipper;
     SVGClipPainter::ClipperState m_clipperState;
-    RawPtrWillBeMember<LayoutSVGResourceMasker> m_masker;
+    LayoutSVGResourceMasker* m_masker;
     OwnPtr<FloatClipRecorder> m_clipRecorder;
     OwnPtr<CompositingRecorder> m_compositingRecorder;
     OwnPtr<ClipPathRecorder> m_clipPathRecorder;
 #if ENABLE(ASSERT)
     bool m_applyClipMaskAndFilterIfNecessaryCalled;
 #endif
 };
 
 } // namespace blink
 
 #endif // SVGPaintContext_h