Use correct cascading order for Shadow DOM v1

third_party/WebKit/Source/core/dom/DocumentOrderedList.h

Index: third_party/WebKit/Source/core/dom/DocumentOrderedList.h
diff --git a/third_party/WebKit/Source/core/dom/DocumentOrderedList.h b/third_party/WebKit/Source/core/dom/DocumentOrderedList.h
index 480866bca2b3bf0e625b1ae74325c4e866f69996..a39792b29bbb664a697242d1fa53b842884bddd1 100644
--- a/third_party/WebKit/Source/core/dom/DocumentOrderedList.h
+++ b/third_party/WebKit/Source/core/dom/DocumentOrderedList.h
@@ -48,10 +48,14 @@ public:
     size_t size() const { return m_nodes.size(); }
 
     using iterator = WillBeHeapListHashSet<RawPtrWillBeMember<Node>, 32>::iterator;
+    using const_reverse_iterator = WillBeHeapListHashSet<RawPtrWillBeMember<Node>, 32>::const_reverse_iterator;
 
     iterator begin() { return m_nodes.begin(); }
     iterator end() { return m_nodes.end(); }
 
+    const_reverse_iterator rbegin() const { return m_nodes.rbegin(); }
+    const_reverse_iterator rend() const { return m_nodes.rend(); }
+
     DECLARE_TRACE();
 
 private: