Bug 1291280 - Part 4. Fix compile error after enable-mask-as-shorthand. r=me

MozReview-Commit-ID: Edy8CiMGCfK

--HG--
extra : rebase_source : d71674ac41d063f85d4658d683cdf315283643ea
extra : amend_source : e897c5cd5e7db049abfb4c9657038f7d820e2913

layout/style/nsRuleNode.cpp

@@ -9988,7 +9988,7 @@ nsRuleNode::ComputeSVGResetData(void* aStartStruct,
                     svgReset->mMask.mLayers,
                     parentSVGReset->mMask.mLayers,
                     &nsStyleImageLayers::Layer::mSourceURI,
-                    nsCOMPtr<nsIURI>(), parentSVGReset->mMask.mImageCount,
+                    FragmentOrURL(), parentSVGReset->mMask.mImageCount,
                     svgReset->mMask.mImageCount,
                     maxItemCount, rebuild, conditions);