Move parts of core/dom to C++11

Source/core/dom/DocumentOrderedList.h

Index: Source/core/dom/DocumentOrderedList.h
diff --git a/Source/core/dom/DocumentOrderedList.h b/Source/core/dom/DocumentOrderedList.h
index 73d0cce0f7f02535ca3f13905101e982fccc5a3f..f42b6dae1c3de8f8ffd0c73dfbecfb783724f95f 100644
--- a/Source/core/dom/DocumentOrderedList.h
+++ b/Source/core/dom/DocumentOrderedList.h
@@ -49,7 +49,7 @@ public:
     void clear() { m_nodes.clear(); }
     size_t size() const { return m_nodes.size(); }
 
-    typedef WillBeHeapListHashSet<RawPtrWillBeMember<Node>, 32>::iterator iterator;
+    using iterator = WillBeHeapListHashSet<RawPtrWillBeMember<Node>, 32>::iterator;
 
     iterator begin() { return m_nodes.begin(); }
     iterator end() { return m_nodes.end(); }