[inspector] Refactor protocol-test.js

test/inspector/debugger/async-stack-for-promise.js

 // Copyright 2016 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 async chains for promises are correct.');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that async chains for promises are correct.');
 
-InspectorTest.addScript(`
+contextGroup.addScript(`
 function foo1() {
   debugger;
 }
 
 function foo2() {
   debugger;
 }
 
 function promise() {
   var resolve;
@@ skipping 194 matching lines @@
 
   return testPromise;
 }
 
 function reject() {
   return Promise.reject().catch(foo1);
 }
 
 //# sourceURL=test.js`, 7, 26);
 
-InspectorTest.setupScriptMap();
+session.setupScriptMap();
 Protocol.Debugger.onPaused(message => {
-  InspectorTest.logCallFrames(message.params.callFrames);
-  InspectorTest.logAsyncStackTrace(message.params.asyncStackTrace);
+  session.logCallFrames(message.params.callFrames);
+  session.logAsyncStackTrace(message.params.asyncStackTrace);
   InspectorTest.log('');
   Protocol.Debugger.resume();
 });
 
 Protocol.Debugger.enable();
 Protocol.Debugger.setAsyncCallStackDepth({ maxDepth: 128 });
 var testList = [
   'promise',
   'promiseResolvedBySetTimeout',
   'promiseAll',
@@ skipping 15 matching lines @@
     Protocol.Runtime.evaluate({ expression: \`${name}()
 //# sourceURL=test${capitalize(name)}.js\`, awaitPromise: true})
       .then(next);
   })
   `);
 }));
 
 function capitalize(string) {
   return string.charAt(0).toUpperCase() + string.slice(1);
 }