* **Electron Version** 4.0.4
* **Operating System** Windows 10 32 bit
* **Last known working Electron version** 3.1.3

### Expected Behavior
`webContents.print()` shold send print job to a printer

### Actual behavior
Nothing happens. Callback doesn't gets called. 

`printToPDF` works though.

### To Reproduce
```
let deviceName = 'HP LaserJet 1020'
let options = {deviceName, silent: true}
win.webContents.print({}, (err) => {
    if (!err)
      console.error('printing failed')
})
```

atom/browser/api/atom_api_web_contents.cc
const content::LoadCommittedDetails& details) {
  Emit("navigation-entry-commited", details.entry->GetURL(),
       details.is_same_document, details.did_replace_entry);
}
void WebContents::SetBackgroundThrottling(bool allowed) {
  background_throttling_ = allowed;
  auto* contents = web_contents();
  if (!contents) {
    return;
  }
  const auto* render_view_host = contents->GetRenderViewHost();
  if (!render_view_host) {
    return;
  }
  auto* render_process_host = render_view_host->GetProcess();
  if (!render_process_host) {
    return;
  }
  auto* render_widget_host_impl = content::RenderWidgetHostImpl::FromID(
      render_process_host->GetID(), render_view_host->GetRoutingID());
  if (!render_widget_host_impl) {
    return;
  }
  render_widget_host_impl->disable_hidden_ = !background_throttling_;
  if (render_widget_host_impl->is_hidden()) {
    render_widget_host_impl->WasShown(false);
  }
}
int WebContents::GetProcessID() const {