[inspector] Refactor protocol-test.js

test/inspector/runtime/console-time-end-format.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 format of console.timeEnd output');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks format of console.timeEnd output');
 
 Protocol.Runtime.enable();
 Protocol.Runtime.onConsoleAPICalled(message => {
   InspectorTest.log(message.params.args[0].value);
 });
 
 InspectorTest.runTestSuite([
   function zero(next) {
     checkInterval(0.0).then(next);
   },
@@ skipping 20 matching lines @@
 function checkInterval(time) {
   utils.setCurrentTimeMSForTest(0.0);
   return Protocol.Runtime.evaluate({
     expression: `console.log('js: ' + ${time} + 'ms')`})
     .then(() => Protocol.Runtime.evaluate({
       expression: 'console.time(\'timeEnd\')'}))
     .then(() => utils.setCurrentTimeMSForTest(time))
     .then(() => Protocol.Runtime.evaluate({
       expression: 'console.timeEnd(\'timeEnd\')'}));
 }