Bug 1081362 - Change nsStyleBasicShape pointer to an nsRefPtr, to avoid leak in unexpected case. r=dholbert

layout/style/nsRuleNode.cpp

@@ -8897,7 +8897,7 @@ nsRuleNode::SetStyleClipPathToCSSValue(nsStyleClipPath* aStyleClipPath,
   const nsCSSValueList* cur = aValue->GetListValue();
 
   uint8_t sizingBox = NS_STYLE_CLIP_SHAPE_SIZING_NOBOX;
-  nsStyleBasicShape* basicShape = nullptr;
+  nsRefPtr<nsStyleBasicShape> basicShape;
   for (unsigned i = 0; i < 2; ++i) {
     if (!cur) {
       break;