[JS TESTS] Rewrite web demo tests using new test infrastructure

js/js.translator/testData/webDemoExamples/objectOrientedHello.kt

@@ -0,0 +1,12 @@
+// MAIN_ARGS: [Pavel]
+
+class Greeter(name: String) {
+    val name = name
+    fun greet() {
+        println("Hello, ${name}!");
+    }
+}
+
+fun main(args: Array<String>) {
+    Greeter(args[0]).greet()
+}