[inspector] Refactor protocol-test.js

test/inspector/runtime/console-line-and-column.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.
 
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests line and column numbers in console messages');
+
 Protocol.Runtime.enable();
 
 addConsoleMessagePromise("console.log(239)")
   .then(message => InspectorTest.logMessage(message))
   .then(() => addConsoleMessagePromise("var l = console.log;\n  l(239)"))
   .then(message => InspectorTest.logMessage(message))
   .then(() => InspectorTest.completeTest());
 
 function addConsoleMessagePromise(expression)
 {
   var wait = Protocol.Runtime.onceConsoleAPICalled();
   Protocol.Runtime.evaluate({ expression: expression });
   return wait;
 }