- 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
v8::Handle<v8::Context> context, content::RenderFrame* render_frame) {
  
  
  if (!render_frame->IsMainFrame() && !IsDevToolsExtension(render_frame))
    return;
  
  bool first_time = node_bindings_->uv_env() == nullptr;
  
  if (first_time) {
    node_bindings_->Initialize();
    node_bindings_->PrepareMessageLoop();
  }
  
  node::Environment* env = node_bindings_->CreateEnvironment(context);
  
  atom_bindings_->BindTo(env->isolate(), env->process_object());
  AddRenderBindings(env->isolate(), env->process_object(),
                    preferences_manager_.get());
  
  node_bindings_->LoadEnvironment(env);
  if (first_time) {
    
    node_bindings_->set_uv_env(env);
    
    node_bindings_->RunMessageLoop();
  }
}
void AtomRendererClient::WillReleaseScriptContext(