Remove the workaround for ServiceLoader bug

import java.util.Iterator;
import java.util.ServiceLoader;

public class ServiceLoaderTest {
    public static class I1 extends ServiceLoaderTest {}  // A dummy provider.
    public static class I2 extends ServiceLoaderTest {}  // An other provider.

    public static void main(String[] args) {
        test1();
        test2();
    }

    private static void test1() {
        System.out.println();
        System.out.println("---- TEST 1 ----");
        ServiceLoader<ServiceLoaderTest> loader = ServiceLoader.load(ServiceLoaderTest.class);

        Iterator<ServiceLoaderTest> it1 = loader.iterator();
        System.out.println("it1.hasNext() = " + it1.hasNext());
        System.out.println("it1.next()    = " + it1.next());

        Iterator<ServiceLoaderTest> it2 = loader.iterator();
        System.out.println("it2.hasNext() = " + it2.hasNext());
        System.out.println("it2.next()    = " + it2.next());

        System.out.println("it1.hasNext() = " + it1.hasNext());
        System.out.println("it1.next()    = " + it1.next());

        System.out.println("it2.hasNext() = " + it2.hasNext());  // Expected "true" here, but get "false".
    }

    private static void test2() {
        System.out.println();
        System.out.println("---- TEST 2 ----");
        ServiceLoader<ServiceLoaderTest> loader = ServiceLoader.load(ServiceLoaderTest.class);

        Iterator<ServiceLoaderTest> it1 = loader.iterator();
        System.out.println("it1.hasNext() = " + it1.hasNext());
        System.out.println("it1.next()    = " + it1.next());

        Iterator<ServiceLoaderTest> it2 = loader.iterator();
        System.out.println("it1.hasNext() = " + it1.hasNext());
        System.out.println("it2.hasNext() = " + it2.hasNext());
        System.out.println("it1.next()    = " + it1.next());
        System.out.println("it2.next()    = " + it2.next());  // ConcurrentModificationException here.
    }
}