- 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.h
class PreferencesManager;
class NodeBindings;
class AtomRendererClient : public content::ContentRendererClient {
 public:
  AtomRendererClient();
  virtual ~AtomRendererClient();
  void DidCreateScriptContext(
      v8::Handle<v8::Context> context, content::RenderFrame* render_frame);
  void WillReleaseScriptContext(
      v8::Handle<v8::Context> context, content::RenderFrame* render_frame);
 private:
  enum NodeIntegration {
    ALL,
    EXCEPT_IFRAME,
    MANUAL_ENABLE_IFRAME,
    DISABLE,
  };
  
  void RenderThreadStarted() override;
  void RenderFrameCreated(content::RenderFrame*) override;
  void RenderViewCreated(content::RenderView*) override;
  void RunScriptsAtDocumentStart(content::RenderFrame* render_frame) override;
  void RunScriptsAtDocumentEnd(content::RenderFrame* render_frame) override;