code: @BetaApi
    public final Operation deleteVpnTunnel(ProjectRegionVpnTunnelName vpnTunnel) {
  
      DeleteVpnTunnelHttpRequest request =
          DeleteVpnTunnelHttpRequest.newBuilder()
              .setVpnTunnel(vpnTunnel == null ? null : vpnTunnel.toString())
              .build();
      return deleteVpnTunnel(request);
    }
docs: Deletes the specified VpnTunnel resource.
  
  <p>Sample code:
  
  <pre><code>
  try (VpnTunnelClient vpnTunnelClient = VpnTunnelClient.create()) {
  ProjectRegionVpnTunnelName vpnTunnel = ProjectRegionVpnTunnelName.of("[PROJECT]", "[REGION]", "[VPN_TUNNEL]");
  Operation response = vpnTunnelClient.deleteVpnTunnel(vpnTunnel);
  }
  </code></pre>
  
  @param vpnTunnel Name of the VpnTunnel resource to delete.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails