diff -r 000000000000 -r 6474c204b198 content/base/src/StyleSheetList.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/src/StyleSheetList.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "mozilla/dom/StyleSheetList.h"
+
+#include "mozilla/dom/StyleSheetListBinding.h"
+#include "nsCSSStyleSheet.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(StyleSheetList)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(StyleSheetList)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsIDOMStyleSheetList)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(StyleSheetList)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(StyleSheetList)
+
+/* virtual */ JSObject*
+StyleSheetList::WrapObject(JSContext* aCx)
+{
+  return StyleSheetListBinding::Wrap(aCx, this);
+}
+
+NS_IMETHODIMP
+StyleSheetList::GetLength(uint32_t* aLength)
+{
+  *aLength = Length();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+StyleSheetList::SlowItem(uint32_t aIndex, nsIDOMStyleSheet** aItem)
+{
+  NS_IF_ADDREF(*aItem = Item(aIndex));
+  return NS_OK;
+}
+
+} // namespace dom
+} // namespace mozilla