[inspector] Refactor inspector test

test/inspector/debugger/destory-in-break-program.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.
 
 InspectorTest.log('Check destroying agent inside of breakProgram');
 
 (async function test(){
   await Protocol.Debugger.enable();
   Protocol.Runtime.evaluate({expression: 'inspector.breakProgram(\'\', \'{}\')'});
   await Protocol.Debugger.oncePaused();
-  utils.disconnect();
+  InspectorTest.session.disconnect();
   utils.quit();
 })();