[inspector] Refactor protocol-test.js

test/inspector/debugger/set-script-source-exception.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 that setScriptSource completes correctly when an exception is thrown.');
+let {session, contextGroup, Protocol} = InspectorTest.start('Check that setScriptSource completes correctly when an exception is thrown.');
 
 Protocol.Debugger.enable();
 
 InspectorTest.runTestSuite([
   function testIncorrectScriptId(next) {
     Protocol.Debugger.setScriptSource({ scriptId: '-1', scriptSource: '0' })
       .then(InspectorTest.logMessage)
       .then(next);
   },
 
   function testSourceWithSyntaxError(next) {
     Protocol.Debugger.onceScriptParsed()
       .then(message => Protocol.Debugger.setScriptSource({ scriptId: message.params.scriptId, scriptSource: 'a # b' }))
       .then(InspectorTest.logMessage)
       .then(next);
-    InspectorTest.addScript('function foo() {}');
+    contextGroup.addScript('function foo() {}');
   }
 ]);