diff -r 000000000000 -r 6474c204b198 parser/html/nsHtml5Atom.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parser/html/nsHtml5Atom.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,89 @@
+/* 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 "nsHtml5Atom.h"
+#include "nsAutoPtr.h"
+#include "mozilla/unused.h"
+
+nsHtml5Atom::nsHtml5Atom(const nsAString& aString)
+{
+  mLength = aString.Length();
+  nsRefPtr<nsStringBuffer> buf = nsStringBuffer::FromString(aString);
+  if (buf) {
+    mString = static_cast<char16_t*>(buf->Data());
+  } else {
+    buf = nsStringBuffer::Alloc((mLength + 1) * sizeof(char16_t));
+    mString = static_cast<char16_t*>(buf->Data());
+    CopyUnicodeTo(aString, 0, mString, mLength);
+    mString[mLength] = char16_t(0);
+  }
+
+  NS_ASSERTION(mString[mLength] == char16_t(0), "null terminated");
+  NS_ASSERTION(buf && buf->StorageSize() >= (mLength+1) * sizeof(char16_t),
+               "enough storage");
+  NS_ASSERTION(Equals(aString), "correct data");
+
+  // Take ownership of buffer
+  mozilla::unused << buf.forget();
+}
+
+nsHtml5Atom::~nsHtml5Atom()
+{
+  nsStringBuffer::FromData(mString)->Release();
+}
+
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsHtml5Atom::AddRef()
+{
+  NS_NOTREACHED("Attempt to AddRef an nsHtml5Atom.");
+  return 2;
+}
+
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsHtml5Atom::Release()
+{
+  NS_NOTREACHED("Attempt to Release an nsHtml5Atom.");
+  return 1;
+}
+
+NS_IMETHODIMP
+nsHtml5Atom::QueryInterface(REFNSIID aIID, void** aInstancePtr)
+{
+  NS_NOTREACHED("Attempt to call QueryInterface an nsHtml5Atom.");
+  return NS_ERROR_UNEXPECTED;
+}
+
+NS_IMETHODIMP 
+nsHtml5Atom::ScriptableToString(nsAString& aBuf)
+{
+  NS_NOTREACHED("Should not call ScriptableToString.");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsHtml5Atom::ToUTF8String(nsACString& aReturn)
+{
+  NS_NOTREACHED("Should not attempt to convert to an UTF-8 string.");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP_(bool)
+nsHtml5Atom::IsStaticAtom()
+{
+  return false;
+}
+
+NS_IMETHODIMP
+nsHtml5Atom::ScriptableEquals(const nsAString& aString, bool* aResult)
+{
+  NS_NOTREACHED("Should not call ScriptableEquals.");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP_(bool)
+nsHtml5Atom::EqualsUTF8(const nsACString& aString)
+{
+  NS_NOTREACHED("Should not attempt to compare with an UTF-8 string.");
+  return false;
+}