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* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * <!-- (output of `node_modules/.bin/electron --version`) e.g. 4.0.3 -->9.2.0
* **Operating System:**
  * <!-- (Platform and Version) e.g. macOS 10.13.6 / Windows 10 (1803) / Ubuntu 18.04 x64 -->win10
* **Last Known Working Electron version:**
  * <!-- (if applicable) e.g. 3.1.0 -->

### Expected Behavior
[this is config](https://www.electronjs.org/docs/api/web-contents#contentsprintoptions-callback)
<!-- A clear and concise description of what you expected to happen. -->The saved PDF has a custom `header`, and the `pageRanges` is work.

### Actual Behavior
<!-- A clear and concise description of what actually happened. -->
`header` and `pageRanges` is not work.
### To Reproduce
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[my electron fiddle](https://gist.github.com/36d96e2fe459dab8ffed2a764d751528)
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### Screenshots
<!-- If applicable, add screenshots to help explain your problem. -->
![image](https://user-images.githubusercontent.com/19225429/90504323-7d74e680-e183-11ea-86df-6f6925e77616.png)


### Additional Information
<!-- Add any other context about the problem here. -->
Finally, who can tell me how to determine the total number of pages generated by the printer system of Chrome?

shell/browser/api/electron_api_web_contents.cc
std::vector<printing::PrinterBasicInfo> printers;
  auto print_backend = printing::PrintBackend::CreateInstance(
      nullptr, g_browser_process->GetApplicationLocale());
  {
     TODO(deepak1556): Deprecate this api in favor of an
     async version and post a non blocing task call.
    base::ThreadRestrictions::ScopedAllowIO allow_io;
    print_backend->EnumeratePrinters(&printers);
  }
  return printers;
}
v8::Local<v8::Promise> WebContents::PrintToPDF(base::DictionaryValue settings) {
  v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
  gin_helper::Promise<v8::Local<v8::Value>> promise(isolate);
  v8::Local<v8::Promise> handle = promise.GetHandle();
  PrintPreviewMessageHandler::FromWebContents(ontents())
      ->PrintToPDF(std::move(settings), std::move(promise));
  return handle;
}
#endif
void WebContents::AddWorkSpace(gin::Arguments* args,
                               const base::FilePath& path) {
  if (path.empty()) {
    gin_helper::ErrorThrower(args->isolate())
        .ThrowError("path cannot be empty");
    return;
  }
  DevToolsAddFileSystem(std::string(), path);
}
void WebContents::RemoveWorkSpace(gin::Arguments* args,