Change GraphicsContext::createCompatibleBuffer to return something non-null

Source/core/rendering/svg/SVGRenderingContext.cpp

Index: Source/core/rendering/svg/SVGRenderingContext.cpp
diff --git a/Source/core/rendering/svg/SVGRenderingContext.cpp b/Source/core/rendering/svg/SVGRenderingContext.cpp
index 06ace607eedf0e1f8c5823e26f49808ed26750d6..104c5faa3c40a49393acdff1927716431685ea4c 100644
--- a/Source/core/rendering/svg/SVGRenderingContext.cpp
+++ b/Source/core/rendering/svg/SVGRenderingContext.cpp
@@ -294,7 +294,7 @@ bool SVGRenderingContext::bufferForeground(OwnPtr<ImageBuffer>& imageBuffer)
 
     // Create a new buffer and paint the foreground into it.
     if (!imageBuffer) {
-        if ((imageBuffer = m_paintInfo->context->createCompatibleBuffer(expandedIntSize(boundingBox.size())))) {
+        if ((imageBuffer = m_paintInfo->context->createRasterBuffer(expandedIntSize(boundingBox.size())))) {
             GraphicsContext* bufferedRenderingContext = imageBuffer->context();
             bufferedRenderingContext->translate(-boundingBox.x(), -boundingBox.y());
             PaintInfo bufferedInfo(*m_paintInfo);