[wasm] Add inspector test for stepping

test/inspector/protocol-test.js

Index: test/inspector/protocol-test.js
diff --git a/test/inspector/protocol-test.js b/test/inspector/protocol-test.js
index 37e6447f79235410871e23ffebe0d79bb5832674..9cc72ed862276996ae4013c0ca71b23a0cc0c1a6 100644
--- a/test/inspector/protocol-test.js
+++ b/test/inspector/protocol-test.js
@@ -20,7 +20,8 @@ Protocol = new Proxy({}, {
           var eventName = match[2];
           eventName = eventName.charAt(0).toLowerCase() + eventName.slice(1);
           if (match[1])
-            return (args) => InspectorTest._waitForEventPromise(`${agentName}.${eventName}`, args || {});
+            return () => InspectorTest._waitForEventPromise(
+                       `${agentName}.${eventName}`);
           else
             return (listener) => { InspectorTest._eventHandler[`${agentName}.${eventName}`] = listener };
         }