Use a boolean hasCompositedLayerMapping() accessor instead of the pointer

Source/core/rendering/svg/SVGRenderingContext.cpp

 /*
  * Copyright (C) 2007, 2008 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) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2009-2010. 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
@@ skipping 210 matching lines @@
 
     // Continue walking up the layer tree, accumulating CSS transforms.
     RenderLayer* layer = renderer ? renderer->enclosingLayer() : 0;
     while (layer) {
         if (TransformationMatrix* layerTransform = layer->transform())
             absoluteTransform = layerTransform->toAffineTransform() * absoluteTransform;
 
         // We can stop at compositing layers, to match the backing resolution.
         // FIXME: should we be computing the transform to the nearest composited layer,
         // or the nearest composited layer that does not paint into its ancestor?
-        if (layer->compositedLayerMapping())
+        // I think this is the nearest composited ancestor since we will inherit its
+        // transforms in the composited layer tree.
+        if (layer->hasCompositedLayerMapping())
             break;
 
         layer = layer->parent();
     }
 
     if (deviceScaleFactor != 1)
         absoluteTransform.scale(deviceScaleFactor);
 }
 
 bool SVGRenderingContext::createImageBufferForPattern(const FloatRect& absoluteTargetRect, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer, RenderingMode renderingMode)
@@ skipping 81 matching lines @@
             toRenderSVGImage(m_object)->paintForeground(bufferedInfo);
         } else
             return false;
     }
 
     m_paintInfo->context->drawImageBuffer(imageBuffer.get(), boundingBox);
     return true;
 }
 
 }