Have LiveNodeListBase::ownerNode() return a reference

Source/core/html/HTMLCollection.cpp

Index: Source/core/html/HTMLCollection.cpp
diff --git a/Source/core/html/HTMLCollection.cpp b/Source/core/html/HTMLCollection.cpp
index fd13bbcbd93480251bc0386975bc650f8fa881b0..eddd13143eb5c979044fd7b7271798d3fc897fe9 100644
--- a/Source/core/html/HTMLCollection.cpp
+++ b/Source/core/html/HTMLCollection.cpp
@@ -181,7 +181,7 @@ HTMLCollection::~HTMLCollection()
     // HTMLNameCollection, ClassCollection and TagCollection remove cache by themselves.
     if (type() != WindowNamedItems && type() != DocumentNamedItems && type() != ClassCollectionType
         && type() != HTMLTagCollectionType && type() != TagCollectionType) {
-        ownerNode()->nodeLists()->removeCache(this, type());
+        ownerNode().nodeLists()->removeCache(this, type());
     }
 }