[inspector] Refactor inspector test

test/inspector/json-parse.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.
 
-const id = ++InspectorTest._requestId;
+const id = ++InspectorTest.session._requestId;
 var command = { "method": "Runtime.evaluate", "params": { expression: "\"!!!\"" }, "id": id };
-InspectorTest.sendRawCommand(id, JSON.stringify(command).replace("!!!", "\\u041F\\u0440\\u0438\\u0432\\u0435\\u0442 \\u043C\\u0438\\u0440"), step2);
+InspectorTest.session.sendRawCommand(id, JSON.stringify(command).replace("!!!", "\\u041F\\u0440\\u0438\\u0432\\u0435\\u0442 \\u043C\\u0438\\u0440"), step2);
 
 function step2(msg)
 {
   msg.id = 1;
   InspectorTest.logObject(msg);
   InspectorTest.completeTest();
 }