diff -r 000000000000 -r 6474c204b198 parser/html/nsHtml5OwningUTF16Buffer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/parser/html/nsHtml5OwningUTF16Buffer.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,87 @@
+/* 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 "nsHtml5OwningUTF16Buffer.h"
+
+nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(char16_t* aBuffer)
+  : nsHtml5UTF16Buffer(aBuffer, 0),
+    next(nullptr),
+    key(nullptr)
+{
+  MOZ_COUNT_CTOR(nsHtml5OwningUTF16Buffer);
+}
+
+nsHtml5OwningUTF16Buffer::nsHtml5OwningUTF16Buffer(void* aKey)
+  : nsHtml5UTF16Buffer(nullptr, 0),
+    next(nullptr),
+    key(aKey)
+{
+  MOZ_COUNT_CTOR(nsHtml5OwningUTF16Buffer);
+}
+
+nsHtml5OwningUTF16Buffer::~nsHtml5OwningUTF16Buffer()
+{
+  MOZ_COUNT_DTOR(nsHtml5OwningUTF16Buffer);
+  DeleteBuffer();
+
+  // This is to avoid dtor recursion on 'next', bug 706932.
+  nsRefPtr<nsHtml5OwningUTF16Buffer> tail;
+  tail.swap(next);
+  while (tail && tail->mRefCnt == 1) {
+    nsRefPtr<nsHtml5OwningUTF16Buffer> tmp;
+    tmp.swap(tail->next);
+    tail.swap(tmp);
+  }
+}
+
+// static
+already_AddRefed<nsHtml5OwningUTF16Buffer>
+nsHtml5OwningUTF16Buffer::FalliblyCreate(int32_t aLength)
+{
+  const mozilla::fallible_t fallible = mozilla::fallible_t();
+  char16_t* newBuf = new (fallible) char16_t[aLength];
+  if (!newBuf) {
+    return nullptr;
+  }
+  nsRefPtr<nsHtml5OwningUTF16Buffer> newObj =
+    new (fallible) nsHtml5OwningUTF16Buffer(newBuf);
+  if (!newObj) {
+    delete[] newBuf;
+    return nullptr;
+  }
+  return newObj.forget();
+}
+
+void
+nsHtml5OwningUTF16Buffer::Swap(nsHtml5OwningUTF16Buffer* aOther)
+{
+  nsHtml5UTF16Buffer::Swap(aOther);
+}
+
+
+// Not using macros for AddRef and Release in order to be able to refcount on
+// and create on different threads.
+
+nsrefcnt
+nsHtml5OwningUTF16Buffer::AddRef()
+{
+  NS_PRECONDITION(int32_t(mRefCnt) >= 0, "Illegal refcount.");
+  ++mRefCnt;
+  NS_LOG_ADDREF(this, mRefCnt, "nsHtml5OwningUTF16Buffer", sizeof(*this));
+  return mRefCnt;
+}
+
+nsrefcnt
+nsHtml5OwningUTF16Buffer::Release()
+{
+  NS_PRECONDITION(0 != mRefCnt, "Release without AddRef.");
+  --mRefCnt;
+  NS_LOG_RELEASE(this, mRefCnt, "nsHtml5OwningUTF16Buffer");
+  if (mRefCnt == 0) {
+    mRefCnt = 1; /* stabilize */
+    delete this;
+    return 0;
+  }
+  return mRefCnt;
+}