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diff --git a/ipc/glue/FileDescriptorSetParent.h b/ipc/glue/FileDescriptorSetParent.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_ipc_FileDescriptorSetParent_h__
+#define mozilla_ipc_FileDescriptorSetParent_h__
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ipc/PFileDescriptorSetParent.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+namespace dom {
+
+class nsIContentParent;
+
+} // namespace dom
+
+namespace ipc {
+
+class BackgroundParentImpl;
+class FileDescriptor;
+
+class FileDescriptorSetParent final
+ : public PFileDescriptorSetParent
+{
+ friend class BackgroundParentImpl;
+ friend class mozilla::dom::nsIContentParent;
+
+ nsTArray<FileDescriptor> mFileDescriptors;
+
+public:
+ void
+ ForgetFileDescriptors(nsTArray<FileDescriptor>& aFileDescriptors);
+
+private:
+ explicit FileDescriptorSetParent(const FileDescriptor& aFileDescriptor);
+ ~FileDescriptorSetParent();
+
+ virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+
+ virtual bool
+ RecvAddFileDescriptor(const FileDescriptor& aFileDescriptor) override;
+};
+
+} // namespace ipc
+} // namespace mozilla
+
+#endif // mozilla_ipc_FileDescriptorSetParent_h__