ReferenceError: process is not defined

```
ReferenceError: process is not defined
at Readable.pipe (_stream_readable.js:581:1)
at pipe (index.js:56:1)
at Array.reduce ()
at Object.pump [as default] (index.js:79:1)
at new BaseProvider (BaseProvider.js:49:1)
at new MetaMaskInpageProvider (MetaMaskInpageProvider.js:24:1)
at createMetaMaskProvider (index.js:13:1)
```

Start by reproducing the ReferenceError and tracing the listed calls from index.js into BaseProvider.js and MetaMaskInpageProvider.js, with particular attention to the _stream_readable.js frame. The issue provides no reproduction steps or named test; done should mean provider creation no longer raises this error while the reported pipe path still works.

Written by the indexing model from the issue text.