Prepare SVGLengthContext for oilpan

Source/core/svg/SVGLengthContext.h

 /*
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 32 matching lines @@
     LengthTypePC
 };
 
 enum SVGLengthMode {
     LengthModeWidth = 0,
     LengthModeHeight,
     LengthModeOther
 };
 
 class SVGLengthContext {
+    STACK_ALLOCATED();
 public:
     explicit SVGLengthContext(const SVGElement*);
 
     template<typename T>
     static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
     {
         return SVGLengthContext::resolveRectangle(context, type, viewport, context->x()->currentValue(), context->y()->currentValue(), context->width()->currentValue(), context->height()->currentValue());
     }
 
     static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, PassRefPtr<SVGLength> x, PassRefPtr<SVGLength> y, PassRefPtr<SVGLength> width, PassRefPtr<SVGLength> height);
@@ skipping 10 matching lines @@
 
     float convertValueFromUserUnitsToPercentage(float value, SVGLengthMode, ExceptionState&) const;
     float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, ExceptionState&) const;
 
     float convertValueFromUserUnitsToEMS(float value, ExceptionState&) const;
     float convertValueFromEMSToUserUnits(float value, ExceptionState&) const;
 
     float convertValueFromUserUnitsToEXS(float value, ExceptionState&) const;
     float convertValueFromEXSToUserUnits(float value, ExceptionState&) const;
 
-    const SVGElement* m_context;
+    RawPtrWillBeMember<const SVGElement> m_context;
     FloatRect m_overridenViewport;
 };
 
 } // namespace WebCore
 
 #endif // SVGLengthContext_h