[inspector] Refactor protocol-test.js

test/inspector/runtime/runtime-restore.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.v8
 
-InspectorTest.log('Checks that Runtime agent correctly restore its state.');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that Runtime agent correctly restore its state.');
 
-InspectorTest.addScript(`
+contextGroup.addScript(`
 var formatter = {
     header: function(x)
     {
         return ["span", {}, "Header formatted ", x.name];
     },
 
     hasBody: function(x)
     {
         return true;
     },
@@ skipping 48 matching lines @@
       .then(Protocol.Runtime.disable)
       .then(() => {
         Protocol.Runtime.onConsoleAPICalled(null);
         next();
       });
   },
 ]);
 
 function reconnect() {
   InspectorTest.logMessage('will reconnect..');
-  InspectorTest.session.reconnect();
+  session.reconnect();
 }