- Electron version: 1.2.0
- Operating system: Mac OS X - 10.11.5

I upgraded from 1.1.1 to 1.2.0. 1.2.0 breaks on the following `index.html`:

``` html
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <script>
            console.log(process.env.NODE_ENV)
        </script>
    </head>
    <body>
        <div id="app-container"></div>
    </body>
</html>
```

Error:

```
Uncaught ReferenceError: process is not defined
```

atom/renderer/atom_renderer_client.cc
content::RenderFrame* render_frame) {
  new PepperHelper(render_frame);
  new AtomRenderFrameObserver(render_frame, this);
  
  
  blink::WebSecurityPolicy::registerURLSchemeAsAllowingServiceWorkers("file");
}
void AtomRendererClient::RenderViewCreated(content::RenderView* render_view) {