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### Issue Details

* **Electron Version:**
5.0.0 to 8.0.0 beta7
* **Operating System:**
Windows 10

### Expected Behavior
The did-fail-load event should be fired.

### Actual Behavior
The did-fail-load event is not fired.

### To Reproduce
Add an event handler to the did-fail-load event.
Add an event handler to the certificate-error event and cancel the default handling. Then call the callback with false.
The did-fail-load event will not be fired.

```
mainWindow.webContents.on("certificate-error", (event, url, error, certificate, callback) => {
      event.preventDefault();
      callback(false)
});

mainWindow.webContents.on("did-fail-load", (event, url, error, certificate, callback) => {
      console.log("did-fail-load");
});
```

Electron fiddle gist:
https://gist.github.com/c1427e38bf0af9a5e78088fcea6e3c66

### Additional Information
loadURL returns a Promise, in the certificate error case this Promise will be rejected. The gist will show this too.

```
mainWindow.loadURL('https://expired.badssl.com')
  .then(() => console.log("success"))
  .catch(e => console.log("fail"))
```

shell/browser/api/electron_api_app.cc
std::string file_data, cert_path;
  std::u16string password;
  net::ScopedCERTCertificateList imported_certs;
  int rv = -1;
  std::string* cert_path_ptr = options.FindStringKey("certificate");
  if (cert_path_ptr)
    cert_path = *cert_path_ptr;
  std::string* pwd = options.FindStringKey("password");
  if (pwd)
    password = base::UTF8ToUTF16(*pwd);
  if (!cert_path.empty()) {
    if (base::ReadFileToString(base::FilePath(cert_path), &file_data)) {
      auto module = model->cert_db()->GetPrivateSlot();
      rv = model->ImportFromPKCS12(module.get(), file_data, password, true,
                                   &imported_certs);
      if (imported_certs.size() > 1) {
        auto it = imported_certs.begin();
        ++it;  
        for (; it != imported_certs.end(); ++it)
          rv &= model->SetCertTrust(it->get(), net::CA_CERT,
                                    net::NSSCertDatabase::TRUSTED_SSL);
      }
    }
  }
  return rv;
}
#endif
void OnIconDataAvailable(gin_helper::Promise<gfx::Image> promise,