Allow ProxyConfigService to report "no configuration set"

net/proxy/proxy_service.h

 // 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 NET_PROXY_PROXY_SERVICE_H_
 #define NET_PROXY_PROXY_SERVICE_H_
 #pragma once
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/waitable_event.h"
 #include "net/base/completion_callback.h"
+#include "net/base/net_log.h"
 #include "net/base/network_change_notifier.h"
-#include "net/base/net_log.h"
 #include "net/proxy/proxy_config_service.h"
+#include "net/proxy/proxy_info.h"
 #include "net/proxy/proxy_server.h"
-#include "net/proxy/proxy_info.h"
 
 class GURL;
 class MessageLoop;
 
 namespace net {
 
 class HostResolver;
 class InitProxyResolver;
 class ProxyResolver;
 class ProxyScriptFetcher;
@@ skipping 247 matching lines @@
                               const BoundNetLog& net_log);
 
   // Start initialization using |fetched_config_|.
   void InitializeUsingLastFetchedConfig();
 
   // NetworkChangeNotifier::IPAddressObserver
   // When this is called, we re-fetch PAC scripts and re-run WPAD.
   virtual void OnIPAddressChanged();
 
   // ProxyConfigService::Observer
-  virtual void OnProxyConfigChanged(const ProxyConfig& config);
+  virtual void OnProxyConfigChanged(
+      const ProxyConfig& config,
+      ProxyConfigService::ConfigAvailability availability);
 
   scoped_ptr<ProxyConfigService> config_service_;
   scoped_ptr<ProxyResolver> resolver_;
 
   // We store the proxy configuration that was last fetched from the
   // ProxyConfigService, as well as the resulting "effective" configuration.
   // The effective configuration is what we condense the original fetched
   // settings to after testing the various automatic settings (auto-detect
   // and custom PAC url).
   ProxyConfig fetched_config_;
@@ skipping 70 matching lines @@
 
   base::WaitableEvent event_;
   CompletionCallbackImpl<SyncProxyServiceHelper> callback_;
   ProxyInfo proxy_info_;
   int result_;
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_SERVICE_H_