Allow ProxyConfigService to report "no configuration set"

chrome/browser/chromeos/proxy_config_service.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_PROXY_CONFIG_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_PROXY_CONFIG_SERVICE_H_
 #pragma once
 
 #include "chrome/browser/chromeos/proxy_config_service_impl.h"
 
 namespace chromeos {
 
 // Wrapper class for the RefCountedThreadSafe chromeos::ProxyConfigServiceImpl
 // that forwards net::ProxyConfigService interface to the actual implementation,
-// instantiated in
-// chrome/browser/net/chrome_url_request_context.cc::CreateProxyConfigService.
+// instantiated in ProfileIOData::CreateProxyConfigService.
 class ProxyConfigService : public net::ProxyConfigService {
  public:
   explicit ProxyConfigService(const scoped_refptr<ProxyConfigServiceImpl>& impl)
       : impl_(impl) {}
   virtual ~ProxyConfigService() {}
 
   // ProxyConfigService methods.  Called from IO thread.
   virtual void AddObserver(Observer* observer) {
     impl_->AddObserver(observer);
   }
   virtual void RemoveObserver(Observer* observer) {
     impl_->RemoveObserver(observer);
   }
-  virtual bool GetLatestProxyConfig(net::ProxyConfig* config) {
+  virtual ConfigAvailability GetLatestProxyConfig(net::ProxyConfig* config) {
     return impl_->IOGetProxyConfig(config);
   }
 
  private:
   scoped_refptr<ProxyConfigServiceImpl> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyConfigService);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PROXY_CONFIG_SERVICE_H_