[inspector] Refactor protocol-test.js

test/inspector/debugger/asm-js-breakpoint-before-exec.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.
 
 // Flags: --validate-asm --allow-natives-syntax
 
-InspectorTest.log(
+let {session, contextGroup, Protocol} = InspectorTest.start(
     'This test runs asm.js which calls back to JS. Before executing (after ' +
     'the script is parsed) we set breakpoints in the asm.js code.');
 
 function testFunction() {
   function generateAsmJs(stdlib, foreign, heap) {
     'use asm';
     var debugger_fun = foreign.call_debugger;
     function callDebugger() {
       debugger_fun();
     }
@@ skipping 25 matching lines @@
   next();
 }
 
 InspectorTest.runTestSuite([
   function enableDebugger(next) {
     Protocol.Debugger.enable().then(next);
   },
 
   function addScript(next) {
     afterScriptParsedCallback = next;
-    InspectorTest.addScript(testFunction.toString());
+    contextGroup.addScript(testFunction.toString());
   },
 
   function runTestFunction(next) {
     Protocol.Runtime.evaluate({'expression': 'testFunction()'})
         .then(printResultAndContinue.bind(null, next));
   },
 
   function finished(next) {
     InspectorTest.log('Finished TestSuite.');
     next();
@@ skipping 55 matching lines @@
     var thisLine = currentLine;
     currentLine += 1;
     InspectorTest.log('Setting breakpoint on line ' + thisLine);
     Protocol.Debugger
         .setBreakpoint(
             {'location': {'scriptId': scriptId, 'lineNumber': thisLine}})
         .then(setNextBreakpoint);
   }
   setNextBreakpoint();
 }