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diff --git a/content/common/common_param_traits.h b/content/common/common_param_traits.h
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+// Copyright (c) 2011 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.
+
+// This file is used to define IPC::ParamTraits<> specializations for a number
+// of types so that they can be serialized over IPC.  IPC::ParamTraits<>
+// specializations for basic types (like int and std::string) and types in the
+// 'base' project can be found in ipc/ipc_message_utils.h.  This file contains
+// specializations for types that are used by the content code, and which need
+// manual serialization code.  This is usually because they're not structs with
+// public members..
+
+#ifndef CONTENT_COMMON_COMMON_PARAM_TRAITS_H_
+#define CONTENT_COMMON_COMMON_PARAM_TRAITS_H_
+#pragma once
+
+#include "googleurl/src/gurl.h"
+#include "ipc/ipc_message_utils.h"
+// !!! WARNING: DO NOT ADD NEW WEBKIT DEPENDENCIES !!!
+//
+// That means don't add #includes to any file in 'webkit/' or
+// 'third_party/WebKit/'. Chrome Frame and NACL build parts of base/ and
+// content/common/ for a mini-library that doesn't depend on webkit.
+
+// Forward declarations.
+class GURL;
+
+namespace IPC {
+
+template <>
+struct ParamTraits<GURL> {
+  typedef GURL param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
+}  // namespace IPC
+
+#endif  // CONTENT_COMMON_COMMON_PARAM_TRAITS_H_