[inspector] Refactor protocol-test.js

test/inspector/debugger/max-async-call-chain-depth.js

Index: test/inspector/debugger/max-async-call-chain-depth.js
diff --git a/test/inspector/debugger/max-async-call-chain-depth.js b/test/inspector/debugger/max-async-call-chain-depth.js
index bf6d2d31afb87b0162732a0f4f2361d4ecdd67f6..ae98f55037b56fdf3a1eada1408305797a6f938e 100644
--- a/test/inspector/debugger/max-async-call-chain-depth.js
+++ b/test/inspector/debugger/max-async-call-chain-depth.js
@@ -1,8 +1,9 @@
 // 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.
+
 // TODO(kozyatinskiy): fix or remove it later.
-InspectorTest.log('Checks that we trim async call chains correctly.');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks that we trim async call chains correctly.');
 
 Protocol.Debugger.enable();
 InspectorTest.log('set async chain depth to 8');