Update navigator.services API to use the new services.onconnect event [1/3].

public/platform/modules/navigator_services/WebServicePortCallbacks.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebServicePortCallbacks_h
+#define WebServicePortCallbacks_h
+
+#include "public/platform/WebCallbacks.h"
+#include "public/platform/modules/navigator_services/WebServicePort.h"
+
+namespace blink {
+
+using WebServicePortConnectCallbacks = WebCallbacks<WebServicePortID, void>;
+
+// Ownership of the ports passed to onSuccess is kept with the caller, and its
+// lifetime does not outlive past the end of the onSuccess call.
+using WebServicePortConnectEventCallbacks = WebCallbacks<WebServicePort, void>;
+
+} // namespace blink
+
+#endif // WebServicePortCallbacks_h