diff -r 000000000000 -r 6474c204b198 layout/ipc/RenderFrameChild.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/ipc/RenderFrameChild.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* 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 "RenderFrameChild.h"
+#include "mozilla/layers/LayerTransactionChild.h"
+
+using mozilla::layers::PLayerTransactionChild;
+using mozilla::layers::LayerTransactionChild;
+
+namespace mozilla {
+namespace layout {
+
+void
+RenderFrameChild::Destroy()
+{
+  size_t numChildren = ManagedPLayerTransactionChild().Length();
+  NS_ABORT_IF_FALSE(0 == numChildren || 1 == numChildren,
+                    "render frame must only have 0 or 1 layer forwarder");
+
+  if (numChildren) {
+    LayerTransactionChild* layers =
+      static_cast<LayerTransactionChild*>(ManagedPLayerTransactionChild()[0]);
+    layers->Destroy();
+    // |layers| was just deleted, take care
+  }
+
+  Send__delete__(this);
+  // WARNING: |this| is dead, hands off
+}
+
+PLayerTransactionChild*
+RenderFrameChild::AllocPLayerTransactionChild()
+{
+  LayerTransactionChild* c = new LayerTransactionChild();
+  c->AddIPDLReference();
+  return c;
+}
+
+bool
+RenderFrameChild::DeallocPLayerTransactionChild(PLayerTransactionChild* aLayers)
+{
+  static_cast<LayerTransactionChild*>(aLayers)->ReleaseIPDLReference();
+  return true;
+}
+
+}  // namespace layout
+}  // namespace mozilla