Make the implementation .cc files go away, instead have the authors give us a...

ipc/ipc_message_utils.h

 // Copyright (c) 2010 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 IPC_IPC_MESSAGE_UTILS_H_
 #define IPC_IPC_MESSAGE_UTILS_H_
 #pragma once
 
 #include <algorithm>
 #include <string>
@@ skipping 103 matching lines @@
     if (!msg_.ReadData(&iter_, data, length)) {
       NOTREACHED();
     }
   }
  private:
   const Message& msg_;
   mutable void* iter_;
 };
 
 //-----------------------------------------------------------------------------
+// A dummy struct to place first just to allow leading commas for all
+// members in the macro-generated constructor initializer lists.
+struct NoParams {
+};
+
+//-----------------------------------------------------------------------------
 // ParamTraits specializations, etc.
 
 template <class P>
 static inline void WriteParam(Message* m, const P& p) {
   typedef typename SimilarTypeTraits<P>::Type Type;
   ParamTraits<Type>::Write(m, static_cast<const Type& >(p));
 }
 
 template <class P>
 static inline bool WARN_UNUSED_RESULT ReadParam(const Message* m, void** iter,
@@ skipping 1054 matching lines @@
     ReplyParam p(a, b, c, d, e);
     WriteParam(reply, p);
   }
 };
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_