Allow ProxyConfigService to report "no configuration set"

net/proxy/proxy_config_service_fixed.h

Index: net/proxy/proxy_config_service_fixed.h
diff --git a/net/proxy/proxy_config_service_fixed.h b/net/proxy/proxy_config_service_fixed.h
index b0d8f03c3853862c830de541314f697913482ad9..54baa5692262ac5ceb42d69d4b3cd30c950928c0 100644
--- a/net/proxy/proxy_config_service_fixed.h
+++ b/net/proxy/proxy_config_service_fixed.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2009 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.
 
@@ -21,7 +21,7 @@ class ProxyConfigServiceFixed : public ProxyConfigService {
   // ProxyConfigService methods:
   virtual void AddObserver(Observer* observer) {}
   virtual void RemoveObserver(Observer* observer) {}
-  virtual bool GetLatestProxyConfig(ProxyConfig* config);
+  virtual ConfigAvailability GetLatestProxyConfig(ProxyConfig* config);
 
  private:
   ProxyConfig pc_;