@Override
    protected AWSSecurityTokenService build(AwsSyncClientParams params) {
        return new AWSSecurityTokenServiceClient(params);
    }
Construct a synchronous implementation of AWSSecurityTokenService using the current builder configuration.

@param params
       Current builder configuration represented as a parameter object.
@return Fully configured implementation of AWSSecurityTokenService.
aws-java-sdk-sts/src/main/java/com/amazonaws/services/securitytoken/AWSSecurityTokenServiceClientBuilder.java