[inspector] Refactor protocol-test.js

test/inspector/runtime/console-api-repeated-in-console.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("Check that console.log is reported through Console domain as well.");
+let {session, contextGroup, Protocol} = InspectorTest.start("Check that console.log is reported through Console domain as well.");
 
 var expectedMessages = 4;
 var messages = [];
 
 Protocol.Runtime.onConsoleAPICalled(consoleAPICalled);
 Protocol.Console.onMessageAdded(messageAdded);
 Protocol.Runtime.enable();
 Protocol.Console.enable();
 Protocol.Runtime.evaluate({ "expression": "console.log(42)" });
 Protocol.Runtime.evaluate({ "expression": "console.error('abc')" });
@@ skipping 12 matching lines @@
     done();
 }
 
 function done()
 {
   messages.sort();
   for (var message of messages)
     InspectorTest.log(message);
   InspectorTest.completeTest();
 }