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* Electron version: 1.6.1
* Operating system: macOS

### Expected behavior

navigator.geolocation.getCurrentPosition runs in background

### Actual behavior

the entire UI is frozen

### How to reproduce

```js
    navigator.geolocation.getCurrentPosition((pos) => {
      console.log('POS: ' + pos);
    }, (err) => {
      console.log('Geolocation error: ', err);
    }, {enableHighAccuracy: false});
```
atom/browser/api/atom_api_web_contents.h
void OnSetTemporaryZoomLevel(double level, IPC::Message* reply_msg);
  
  
  void OnGetZoomLevel(IPC::Message* reply_msg);
  v8::Global<v8::Value> session_;
  v8::Global<v8::Value> devtools_web_contents_;
  v8::Global<v8::Value> debugger_;
  std::unique_ptr<WebViewGuestDelegate> guest_delegate_;
  
  WebContents* embedder_;
  
  WebContentsZoomController* zoom_controller_;
  
  Type type_;
  
  uint32_t request_id_;
  
  bool background_throttling_;
  
  bool enable_devtools_;
  
  
  LoadURLParams deferred_load_url_;
  content::NotificationRegistrar registrar_;
  DISALLOW_COPY_AND_ASSIGN(WebContents);
};
}  
}  
#endif