[inspector] Make InspectorTest.sendCommand* private

test/inspector/console/memory-setter-in-strict-mode.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.
 
 print("Tests checks that console.memory property can be set in strict mode (crbug.com/468611).")
 
-InspectorTest.sendCommand("Runtime.evaluate", { expression: "\"use strict\"\nconsole.memory = {};undefined" }, dumpResult);
+Protocol.Runtime.evaluate({ expression: "\"use strict\"\nconsole.memory = {};undefined" }).then(dumpResult);
 
 function dumpResult(result)
 {
-  result.id = 0;
-  InspectorTest.logObject(result);
+  InspectorTest.logMessage(result);
   InspectorTest.completeTest();
 }