[inspector] Refactor protocol-test.js

test/inspector/debugger/async-console-count-doesnt-crash.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.
 
-InspectorTest.log("setTimeout(console.count, 0) doesn't crash with enabled async stacks.")
+let {session, contextGroup, Protocol} = InspectorTest.start("setTimeout(console.count, 0) doesn't crash with enabled async stacks.")
 
 Protocol.Debugger.enable();
 Protocol.Debugger.setAsyncCallStackDepth({ maxDepth: 1 });
 Protocol.Runtime.evaluate({ expression: "setTimeout(console.count, 0)" });
-InspectorTest.completeTestAfterPendingTimeouts();
+InspectorTest.waitForPendingTasks().then(InspectorTest.completeTest);