[inspector] Make InspectorTest.sendCommand* private

test/inspector/debugger/call-frame-function-location.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.evaluateInPage(
+InspectorTest.addScript(
 `function testFunction()
 {
     var a = 2;
     debugger;
 }`);
 
-InspectorTest.sendCommand("Debugger.enable", {});
-InspectorTest.eventHandler["Debugger.paused"] = handleDebuggerPaused;
-InspectorTest.sendCommand("Runtime.evaluate", { "expression": "setTimeout(testFunction, 0)" });
+Protocol.Debugger.enable();
+Protocol.Debugger.oncePaused().then(handleDebuggerPaused);
+Protocol.Runtime.evaluate({ "expression": "setTimeout(testFunction, 0)" });
 
 function handleDebuggerPaused(messageObject)
 {
   InspectorTest.log("Paused on 'debugger;'");
   var topFrame = messageObject.params.callFrames[0];
   topFrame.location.scriptId = "42";
   topFrame.functionLocation.scriptId = "42";
   InspectorTest.log("Top frame location: " + JSON.stringify(topFrame.location));
   InspectorTest.log("Top frame functionLocation: " + JSON.stringify(topFrame.functionLocation));
   InspectorTest.completeTest();
 }