setOnSSlAuthError method
Invoked when the web view receives a recoverable SSL error for a certificate.
The host application must call either PlatformSslAuthError.cancel or
PlatformSslAuthError.proceed.
Implementation
Future<void> setOnSSlAuthError(SslAuthErrorCallback onSslAuthError) {
  throw UnimplementedError(
    'setOnSSlAuthError is not implemented on the current platform.',
  );
}