Fix gconf for the linux proxy config service....

net/proxy/proxy_config.h

 // Copyright (c) 2006-2008 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_CONFIG_H_
 #define NET_PROXY_PROXY_CONFIG_H_
 
 #include <ostream>
 #include <string>
 #include <vector>
@@ skipping 10 matching lines @@
 
   // Indicates an invalid proxy config.
   enum { INVALID_ID = 0 };
 
   ProxyConfig();
   // Default copy-constructor and assignment operator are OK!
 
   // Used to numerically identify this configuration.
   ID id() const { return id_; }
   void set_id(int id) { id_ = id; }
+  bool is_valid() { return id_ != INVALID_ID; }
 
   // True if the proxy configuration should be auto-detected.
   bool auto_detect;
 
   // If non-empty, indicates the URL of the proxy auto-config file to use.
   GURL pac_url;
 
   struct ProxyRules {
     enum Type {
       TYPE_NO_RULES,
@@ skipping 82 matching lines @@
 // Dumps a human-readable string representation of the configuration to |out|;
 // used when logging the configuration changes.
 std::ostream& operator<<(std::ostream& out, const net::ProxyConfig& config);
 
 // Dumps a human-readable string representation of the |rules| to |out|;
 // used for logging and for better unittest failure output.
 std::ostream& operator<<(std::ostream& out,
                          const net::ProxyConfig::ProxyRules& rules);
 
 #endif  // NET_PROXY_PROXY_CONFIG_H_