code: @Override
      public RemovePermissionResult removePermission(RemovePermissionRequest request) {
          request = beforeClientExecution(request);
          return executeRemovePermission(request);
      }
docs: <p>
  Removes a statement from a topic's access control policy.
  </p>
  
  @param removePermissionRequest
  Input for RemovePermission action.
  @return Result of the RemovePermission operation returned by the service.
  @throws InvalidParameterException
  Indicates that a request parameter does not comply with the associated constraints.
  @throws InternalErrorException
  Indicates an internal service error.
  @throws AuthorizationErrorException
  Indicates that the user has been denied access to the requested resource.
  @throws NotFoundException
  Indicates that the requested resource does not exist.
  @sample AmazonSNS.RemovePermission
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/sns-2010-03-31/RemovePermission" target="_top">AWS API
  Documentation</a>