[inspector] Refactor protocol-test.js

test/inspector/debugger/set-script-source.js

Index: test/inspector/debugger/set-script-source.js
diff --git a/test/inspector/debugger/set-script-source.js b/test/inspector/debugger/set-script-source.js
index 36944cca6c18dd18afd514b20eeb569b982746fb..f13a3a39bb32d6ae16bf28e62dea133e8065fefe 100644
--- a/test/inspector/debugger/set-script-source.js
+++ b/test/inspector/debugger/set-script-source.js
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-InspectorTest.addScript(
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests Debugger.setScriptSource');
+
+contextGroup.addScript(
 `function TestExpression(a, b) {
     return a + b;
 }`);