Cannot find module '_process'

Importing protobuf.js `v6.0.0` or `master` from rawgit gives

`protobuf.js:7 Uncaught Error: Cannot find module '_process'(…)`

on Chromium 54.0.2840.100

Minimal code:
```js
<html>
<head>
<script src="https://cdn.rawgit.com/dcodeIO/protobuf.js/master/dist/protobuf.js"></script>
</head>
</html>
```