Add a ProxyScriptFetcher class for doing asynch downloads of PAC scripts....

net/base/load_flags.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_BASE_LOAD_FLAGS_H__
 #define NET_BASE_LOAD_FLAGS_H__
 
 namespace net {
 
 // These flags provide metadata about the type of the load request.  They are
@@ skipping 46 matching lines @@
   // (The default behavior is to trigger an OnSSLCertificateError callback).
   LOAD_IGNORE_CERT_WRONG_USAGE = 1 << 12,
 
   // This load will not make any changes to cookies, including storing new
   // cookies or updating existing ones.
   LOAD_DO_NOT_SAVE_COOKIES = 1 << 13,
 
   // An SDCH dictionary was advertised, and an SDCH encoded response is
   // possible.
   LOAD_SDCH_DICTIONARY_ADVERTISED = 1 << 14,
+
+  // Do not resolve proxies. This override is used when downloading PAC files
+  // to avoid having a circular dependency.
+  LOAD_BYPASS_PROXY = 1 << 15,
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_LOAD_FLAGS_H__