[inspector] Refactor protocol-test.js

test/inspector/debugger/stepping-ignores-injected-script.js

Index: test/inspector/debugger/stepping-ignores-injected-script.js
diff --git a/test/inspector/debugger/stepping-ignores-injected-script.js b/test/inspector/debugger/stepping-ignores-injected-script.js
index 2b9e4aa7d7cf2f100160c79b79a8ec1a36b30d43..9021664a96c022f0eb43bb2c06516e85b1592718 100644
--- a/test/inspector/debugger/stepping-ignores-injected-script.js
+++ b/test/inspector/debugger/stepping-ignores-injected-script.js
@@ -2,8 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests that stepping ignores injected script');
+
 Protocol.Debugger.onPaused(message => {
-  let url = InspectorTest.session._scriptMap.get(message.params.callFrames[0].location.scriptId).url;
+  let url = session._scriptMap.get(message.params.callFrames[0].location.scriptId).url;
   if (url !== 'test.js') {
     InspectorTest.log('InjectedSciptSource on stack.');
     InspectorTest.completeTest();
@@ -11,7 +13,7 @@ Protocol.Debugger.onPaused(message => {
   Protocol.Debugger.stepInto();
 });
 
-InspectorTest.setupScriptMap();
+session.setupScriptMap();
 Protocol.Debugger.enable();
 Protocol.Debugger.pause();
 Protocol.Runtime.evaluate({expression: 'console.log(42)//# sourceURL=test.js'})