[inspector] Refactor protocol-test.js

test/inspector/debugger/scope-skip-variables-with-empty-name.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.addScript(
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests that scopes do not report variables with empty names');
+
+contextGroup.addScript(
 `function testFunction()
 {
     for (var a of [1]) {
         ++a;
         debugger;
     }
 }`);
 
 Protocol.Debugger.enable();
 Protocol.Debugger.oncePaused().then(dumpScopeOnPause);
@@ skipping 17 matching lines @@
   }
 }
 
 function dumpProperties(message)
 {
   InspectorTest.logMessage(message);
   --waitScopeObjects;
   if (!waitScopeObjects)
     Protocol.Debugger.resume().then(InspectorTest.completeTest);
 }