[inspector] Refactor protocol-test.js

test/inspector/debugger/collect-obsolete-async-tasks.js

 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-InspectorTest.log('Checks that we collect obsolete async tasks with async stacks.');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that we collect obsolete async tasks with async stacks.');
 
-InspectorTest.addScript(`
+contextGroup.addScript(`
 function test() {
   inspector.setMaxAsyncTaskStacks(128);
   var p = Promise.resolve();
 
   inspector.dumpAsyncTaskStacksStateForTest();
   inspector.setMaxAsyncTaskStacks(128);
   inspector.dumpAsyncTaskStacksStateForTest();
 
   p.then(() => 42).then(() => 239);
 
   inspector.dumpAsyncTaskStacksStateForTest();
   inspector.setMaxAsyncTaskStacks(128);
   inspector.dumpAsyncTaskStacksStateForTest();
 
   setTimeout(() => 42, 0);
 
   inspector.dumpAsyncTaskStacksStateForTest();
   inspector.setMaxAsyncTaskStacks(128);
   inspector.dumpAsyncTaskStacksStateForTest();
 }
 `);
 
 (async function test() {
   Protocol.Debugger.enable();
   Protocol.Debugger.setAsyncCallStackDepth({maxDepth: 128});
   await Protocol.Runtime.evaluate({expression: 'test()'});
   InspectorTest.completeTest();
 })()