[inspector] Refactor protocol-test.js

test/inspector/debugger/script-end-location.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('Checks that we report correct endLine, endColumn and source for scripts.');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that we report correct endLine, endColumn and source for scripts.');
 
 var sources = [
 '',
 ' ',
 '  ',
 `
 `,
 `
  `,
 `
    `,
 `
 
 `,
 `
 
  `,
 `
 
   `];
 
 (async function test() {
   Protocol.Debugger.enable();
   for (let source of sources) {
-    InspectorTest.addScript(source);
+    contextGroup.addScript(source);
     var message = await Protocol.Debugger.onceScriptParsed();
     var inspectorSource = (await Protocol.Debugger.getScriptSource({ scriptId: message.params.scriptId })).result.scriptSource;
     var lines = source.split('\n');
     var returned = { endLine: message.params.endLine, endColumn: message.params.endColumn };
     var compiled = { endLine: lines.length - 1, endColumn: lines[lines.length - 1].length };
     InspectorTest.logObject({ returned, compiled });
     if (returned.endLine != compiled.endLine) {
       InspectorTest.log('error: incorrect endLine');
     }
     if (returned.endColumn != compiled.endColumn) {
       InspectorTest.log('error: incorrect endColumn');
     }
     if (source !== inspectorSource) {
       InspectorTest.log('error: incorrect source');
     }
   }
   InspectorTest.completeTest();
 })();