[Chromoting] Update jscompile target to use JS files from gypi.

remoting/webapp/wcs_iq_client_proto.js

-// Copyright (c) 2011 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.
-
-// This file contains type definitions for the WCS IQ client. It is used only
-// with JSCompiler to verify the type-correctness of our code.
-
-/** @suppress {duplicate} */
-var remoting = remoting || {};
-
-/** @constructor
- */
-remoting.WcsIqClient = function() {};
-
-/** @param {function(Array.<string>): void} onMsg The function called when a
- *      message is received.
- *  @return {void} Nothing. */
-remoting.WcsIqClient.prototype.setOnMessage = function(onMsg) {};
-
-/** @return {void} Nothing. */
-remoting.WcsIqClient.prototype.connectChannel = function() {};
-
-/** @param {string} stanza An IQ stanza.
- *  @return {void} Nothing. */
-remoting.WcsIqClient.prototype.sendIq = function(stanza) {};
-
-/** @param {string} token An OAuth2 access token.
- *  @return {void} Nothing. */
-remoting.WcsIqClient.prototype.updateAccessToken = function(token) {};