Clang plugin to check that unstable types are not used in IPC.

ipc/ipc_message_templates.h

Index: ipc/ipc_message_templates.h
diff --git a/ipc/ipc_message_templates.h b/ipc/ipc_message_templates.h
index 17dfc1b9ff221169167c2f3103089a219e14fa5e..343bff73cfaa9df87a18bf9fdd5822c4347bf805 100644
--- a/ipc/ipc_message_templates.h
+++ b/ipc/ipc_message_templates.h
@@ -167,7 +167,7 @@ class MessageT<Meta, base::Tuple<Ins...>, base::Tuple<Outs...>>
     if (ok) {
       ReplyParam reply_params;
       base::DispatchToMethod(obj, func, send_params, &reply_params);
-      WriteParam(reply, reply_params);
+      WriteParamUnchecked(reply, reply_params);
       LogReplyParamsToMessage(reply_params, msg);
     } else {
       NOTREACHED() << "Error deserializing message " << msg->type();