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### Preflight Checklist
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* [ x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [ x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [ 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 --> 10.1.1
* **Operating System:**
  * <!-- (Platform and Version) e.g. macOS 10.13.6 / Windows 10 (1803) / Ubuntu 18.04 x64 --> Windows 10
* **Last Known Working Electron version:**
  * <!-- (if applicable) e.g. 3.1.0 --> 6.1.10

### Expected Behavior
<!-- A clear and concise description of what you expected to happen. -->

The request to function normally except the certificate handler works as intended.

### Actual Behavior
<!-- A clear and concise description of what actually happened. -->

When sending concurrent requests at once, the net request throws an error with net::ERR_CERT_DATABASE_CHANGED.

### To Reproduce

session.setCertificateVerifyProc((r, cb) => cb(0));

// Send net requests as normal

Soon enough, the code will start producing the error shown above.

shell/browser/api/electron_api_session.cc
download::DownloadItem* item) {
  if (item->IsSavePackageDownload())
    return;
  v8::Isolate* isolate = JavascriptEnvironment::GetIsolate();
  v8::Locker locker(isolate);
  v8::HandleScope handle_scope(isolate);
  auto handle = DownloadItem::FromOrCreate(isolate, item);
  if (item->GetState() == download::DownloadItem::INTERRUPTED)
    handle->SetSavePath(item->GetTargetFilePath());
  content::WebContents* web_contents =
      content::DownloadItemUtils::GetWebContents(item);
  bool prevent_default = Emit("will-download", handle, web_contents);
  if (prevent_default) {
    item->Cancel(true);
    item->Remove();
  }
}
#if BUILDFLAG(ENABLE_BUILTIN_SPELLCHECKER)
void Session::OnHunspellDictionaryInitialized(const std::string& language) {