redesign and reimplement proxy config service and tracker, revise proxy ui on cros

chrome/browser/chromeos/proxy_config_service.cc

-// 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.
-
-#include "chrome/browser/chromeos/proxy_config_service.h"
-
-namespace chromeos {
-
-ProxyConfigService::ProxyConfigService(
-    const scoped_refptr<ProxyConfigServiceImpl>& impl)
-    : impl_(impl) {
-}
-
-ProxyConfigService::~ProxyConfigService() {}
-
-void ProxyConfigService::AddObserver(Observer* observer) {
-  impl_->AddObserver(observer);
-}
-
-void ProxyConfigService::RemoveObserver(Observer* observer) {
-  impl_->RemoveObserver(observer);
-}
-
-ProxyConfigService::ConfigAvailability ProxyConfigService::GetLatestProxyConfig(
-    net::ProxyConfig* config) {
-  return impl_->IOGetProxyConfig(config);
-}
-
-}  // namespace chromeos