test: revert cf50305

PR-URL: nodejs#4410

As @Trott points out in nodejs#4364 commit cf50305 is currently
breaking CI. This commit reverts the changes.

test/parallel/test-domain-top-level-error-handler-throw.js

@@ -36,12 +36,10 @@ if (process.argv[2] === 'child') {
       stderrOutput += data.toString();
     });
 
-    child.on('close', function onChildClosed() {
+    child.on('exit', function onChildExited(exitCode, signal) {
       assert(stderrOutput.indexOf(domainErrHandlerExMessage) !== -1);
       assert(stderrOutput.indexOf(internalExMessage) === -1);
-    });
 
-    child.on('exit', function onChildExited(exitCode, signal) {
       var expectedExitCode = 7;
       var expectedSignal = null;