[inspector] Refactor protocol-test.js

test/inspector/debugger/set-async-call-stack-depth.js

Index: test/inspector/debugger/set-async-call-stack-depth.js
diff --git a/test/inspector/debugger/set-async-call-stack-depth.js b/test/inspector/debugger/set-async-call-stack-depth.js
index a9c6f1ce50758d26c9b8cef56036af7a2c57443d..0c7567f4996e435bc27af8f457dfffc19a19f3e3 100644
--- a/test/inspector/debugger/set-async-call-stack-depth.js
+++ b/test/inspector/debugger/set-async-call-stack-depth.js
@@ -4,9 +4,9 @@
 
 // TODO(kozyatinskiy): fix or remove it later with new stack traces it's almost
 // imposible to hit limit.
-InspectorTest.log('Checks that we report not more then maxDepth call chains.');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that we report not more then maxDepth call chains.');
 
-InspectorTest.addScript(`
+contextGroup.addScript(`
 function promisesChain(num) {
   var p = Promise.resolve();
   for (var i = 0; i < num - 1; ++i) {