[inspector] Refactor protocol-test.js

test/inspector/runtime/get-properties-preview.js

Index: test/inspector/runtime/get-properties-preview.js
diff --git a/test/inspector/runtime/get-properties-preview.js b/test/inspector/runtime/get-properties-preview.js
index 62d853a48d6f69e7cfb882a4d7b9f93ea853d7d5..92c6e56426e94995fb29b3da9883ff71a33993d1 100644
--- a/test/inspector/runtime/get-properties-preview.js
+++ b/test/inspector/runtime/get-properties-preview.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.setupInjectedScriptEnvironment();
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests generated previews in Runtime.getProperties');
+
+contextGroup.setupInjectedScriptEnvironment();
 
 Protocol.Runtime.evaluate({ "expression": "({p1: {a:1}, p2: {b:'foo', bb:'bar'}})" }).then(callbackEvaluate);