DevTools: remove experimental webrtc-based remote debugging device provider.

chrome/browser/devtools/device/webrtc/js/webrtc_device_provider.js

-// Copyright 2014 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.
-
-/**
- * @constructor
- */
-function WebRTCDeviceProvider() {
-}
-
-WebRTCDeviceProvider.prototype.handleCommandFailure = function() {
-  // TODO(serya): Remove debugging code and implement.
-  console.error('Command failed');
-};
-
-WebRTCDeviceProvider.prototype.handleCommandSuccess = function(result) {
-  // TODO(serya): Remove debugging code and implement.
-  console.log('Command succeded', result);
-};
-
-WebRTCDeviceProvider.prototype.startSessionIfNeeded = function(deviceId) {
-  // TODO(serya): Remove debugging code and implement.
-  this.lastDeviceId = deviceId;
-};
-
-addEventListener('DOMContentLoaded', function() {
-  window.WebRTCDeviceProvider.instance = new WebRTCDeviceProvider();
-}, false);