code: public Observable<Void> deleteVnetRouteAsync(String resourceGroupName, String name, String vnetName, String routeName) {
          return deleteVnetRouteWithServiceResponseAsync(resourceGroupName, name, vnetName, routeName).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Delete a Virtual Network route in an App Service plan.
  Delete a Virtual Network route in an App Service plan.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param name Name of the App Service plan.
  @param vnetName Name of the Virtual Network.
  @param routeName Name of the Virtual Network route.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.