Convert utility process extension Unpacker IPC to mojo

extensions/common/manifest_location_param_traits.h

Index: extensions/common/manifest_location_param_traits.h
diff --git a/extensions/common/manifest_location_param_traits.h b/extensions/common/manifest_location_param_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..c6ed713392360e7ccde9c2ce2a93b6a3c35def3c
--- /dev/null
+++ b/extensions/common/manifest_location_param_traits.h
@@ -0,0 +1,16 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXTENSIONS_COMMON_MANIFEST_LOCATION_PARAM_TRAITS_H_
+#define EXTENSIONS_COMMON_MANIFEST_LOCATION_PARAM_TRAITS_H_
+
+#include "extensions/common/manifest.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/param_traits_macros.h"
+
+IPC_ENUM_TRAITS_MIN_MAX_VALUE(extensions::Manifest::Location,
+                              extensions::Manifest::INVALID_LOCATION,
+                              extensions::Manifest::NUM_LOCATIONS)
+
+#endif  // EXTENSIONS_COMMON_MANIFEST_LOCATION_PARAM_TRAITS_H_