diff -r 000000000000 -r 6474c204b198 editor/libeditor/base/EditTxn.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editor/libeditor/base/EditTxn.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,50 @@
+/* -*- 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 "EditTxn.h"
+#include "nsError.h"
+#include "nsISupportsBase.h"
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(EditTxn)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_0(EditTxn)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(EditTxn)
+  // We don't have anything to traverse, but some of our subclasses do.
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(EditTxn)
+  NS_INTERFACE_MAP_ENTRY(nsITransaction)
+  NS_INTERFACE_MAP_ENTRY(nsPIEditorTransaction)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsITransaction)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(EditTxn)
+NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(EditTxn, LastRelease())
+
+EditTxn::~EditTxn()
+{
+}
+
+NS_IMETHODIMP
+EditTxn::RedoTransaction(void)
+{
+  return DoTransaction();
+}
+
+NS_IMETHODIMP
+EditTxn::GetIsTransient(bool *aIsTransient)
+{
+  *aIsTransient = false;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+EditTxn::Merge(nsITransaction *aTransaction, bool *aDidMerge)
+{
+  *aDidMerge = false;
+
+  return NS_OK;
+}