Use reference for FillLayer if possible

Source/core/rendering/RenderTableCell.cpp

Index: Source/core/rendering/RenderTableCell.cpp
diff --git a/Source/core/rendering/RenderTableCell.cpp b/Source/core/rendering/RenderTableCell.cpp
index 31746d8549998e1675eefdb86c4ff83346acd6f2..917afea25c05f5b19a600aab0219d4f5a865bf22 100644
--- a/Source/core/rendering/RenderTableCell.cpp
+++ b/Source/core/rendering/RenderTableCell.cpp
@@ -1172,9 +1172,9 @@ void RenderTableCell::paintBackgroundsBehindCell(PaintInfo& paintInfo, const Lay
         adjustedPaintOffset.moveBy(location());
 
     Color c = backgroundObject->resolveColor(CSSPropertyBackgroundColor);
-    const FillLayer* bgLayer = backgroundObject->style()->backgroundLayers();
+    const FillLayer& bgLayer = backgroundObject->style()->backgroundLayers();
 
-    if (bgLayer->hasImage() || c.alpha()) {
+    if (bgLayer.hasImage() || c.alpha()) {
         // We have to clip here because the background would paint
         // on top of the borders otherwise.  This only matters for cells and rows.
         bool shouldClip = backgroundObject->hasLayer() && (backgroundObject == this || backgroundObject == parent()) && tableElt->collapseBorders();