diff -r 000000000000 -r 6474c204b198 docshell/base/nsDocShellTransferableHooks.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docshell/base/nsDocShellTransferableHooks.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+/* 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 "nsDocShellTransferableHooks.h"
+#include "nsIClipboardDragDropHooks.h"
+#include "nsIClipboardDragDropHookList.h"
+#include "nsArrayEnumerator.h"
+
+nsTransferableHookData::nsTransferableHookData()
+{
+}
+
+
+nsTransferableHookData::~nsTransferableHookData()
+{
+}
+
+//*****************************************************************************
+// nsIClipboardDragDropHookList
+//*****************************************************************************
+
+NS_IMPL_ISUPPORTS(nsTransferableHookData, nsIClipboardDragDropHookList)
+
+NS_IMETHODIMP
+nsTransferableHookData::AddClipboardDragDropHooks(
+                                        nsIClipboardDragDropHooks *aOverrides)
+{
+    NS_ENSURE_ARG(aOverrides);
+
+    // don't let a hook be added more than once
+    if (mHookList.IndexOfObject(aOverrides) == -1)
+    {
+        if (!mHookList.AppendObject(aOverrides))
+            return NS_ERROR_FAILURE;
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTransferableHookData::RemoveClipboardDragDropHooks(
+                                         nsIClipboardDragDropHooks *aOverrides)
+{
+    NS_ENSURE_ARG(aOverrides);
+    if (!mHookList.RemoveObject(aOverrides))
+        return NS_ERROR_FAILURE;
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsTransferableHookData::GetHookEnumerator(nsISimpleEnumerator **aResult)
+{
+    return NS_NewArrayEnumerator(aResult, mHookList);
+}