[inspector] Refactor protocol-test.js

test/inspector/runtime/exception-thrown.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("Check that exceptionThrown is supported by test runner.")
+let {session, contextGroup, Protocol} = InspectorTest.start("Check that exceptionThrown is supported by test runner.")
 
 Protocol.Runtime.enable();
 Protocol.Runtime.onExceptionThrown(message => InspectorTest.logMessage(message));
 Protocol.Runtime.evaluate({ expression: "setTimeout(() => { \n  throw new Error() }, 0)" });
 Protocol.Runtime.evaluate({ expression: "setTimeout(\" }\", 0)" });
 Protocol.Runtime.evaluate({ expression: "setTimeout(() => { \n  throw 239; }, 0)" });
-InspectorTest.completeTestAfterPendingTimeouts();
+InspectorTest.waitForPendingTasks().then(InspectorTest.completeTest);