[inspector] Refactor protocol-test.js

test/inspector/debugger/async-set-timeout.js

Index: test/inspector/debugger/async-set-timeout.js
diff --git a/test/inspector/debugger/async-set-timeout.js b/test/inspector/debugger/async-set-timeout.js
index 31712329d37c4ac1326716295b6d12076d9bf611..30096b637f6619942e5d1807d2488a3339dd3538 100644
--- a/test/inspector/debugger/async-set-timeout.js
+++ b/test/inspector/debugger/async-set-timeout.js
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-InspectorTest.log('Checks that async stack contains setTimeout');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that async stack contains setTimeout');
 
-InspectorTest.addScript(`
+contextGroup.addScript(`
 var resolveCallback;
 function foo1() {
   function inner1() {
@@ -29,13 +29,13 @@ function foo3() {
 }
 //# sourceURL=test.js`, 7, 26);
 
-InspectorTest.setupScriptMap();
+session.setupScriptMap();
 Protocol.Debugger.onPaused(message => {
-  InspectorTest.logCallFrames(message.params.callFrames);
+  session.logCallFrames(message.params.callFrames);
   var asyncStackTrace = message.params.asyncStackTrace;
   while (asyncStackTrace) {
     InspectorTest.log(`-- ${asyncStackTrace.description} --`);
-    InspectorTest.logCallFrames(asyncStackTrace.callFrames);
+    session.logCallFrames(asyncStackTrace.callFrames);
     asyncStackTrace = asyncStackTrace.parent;
   }
   InspectorTest.log('');