[inspector] Refactor protocol-test.js

test/inspector/runtime/await-promise.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.
 // Flags: --expose_gc
 
-InspectorTest.log("Tests that Runtime.awaitPromise works.");
+let {session, contextGroup, Protocol} = InspectorTest.start("Tests that Runtime.awaitPromise works.");
 
-InspectorTest.addScript(
+contextGroup.addScript(
 `
 var resolveCallback;
 var rejectCallback;
 function createPromise()
 {
     return new Promise((resolve, reject) => { resolveCallback = resolve; rejectCallback = reject });
 }
 
 function resolvePromise()
 {
@@ skipping 88 matching lines @@
       }
 
       function gcPromise(objectId)
       {
         Protocol.Runtime.releaseObject({ objectId: objectId})
           .then(() => Protocol.Runtime.evaluate({ expression: "gc()" }));
       }
     }
   ]);
 }