diff -r 000000000000 -r 6474c204b198 parser/html/nsHtml5ReleasableElementName.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parser/html/nsHtml5ReleasableElementName.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsHtml5ReleasableElementName.h"
+
+nsHtml5ReleasableElementName::nsHtml5ReleasableElementName(nsIAtom* name)
+  : nsHtml5ElementName(name)
+{
+}
+
+void
+nsHtml5ReleasableElementName::release()
+{
+  delete this;
+}
+
+nsHtml5ElementName* 
+nsHtml5ReleasableElementName::cloneElementName(nsHtml5AtomTable* aInterner)
+{
+  nsIAtom* l = name;
+  if (aInterner) {
+    if (!l->IsStaticAtom()) {
+      nsAutoString str;
+      l->ToString(str);
+      l = aInterner->GetAtom(str);
+    }
+  }
+  return new nsHtml5ReleasableElementName(l);
+}