Adds support for the DHCP portion of the WPAD (proxy auto-discovery) protocol.

net/base/net_error_list.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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate enum.
 
 // This file contains the list of network errors.
 
 //
@@ skipping 428 matching lines @@
 // The HTTP response was too big to drain.
 NET_ERROR(RESPONSE_BODY_TOO_BIG_TO_DRAIN, -345)
 
 // The HTTP response was too big to drain.
 NET_ERROR(RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH, -346)
 
 // SPDY Headers have been received, but not all of them - status or version
 // headers are missing, so we're expecting additional frames to complete them.
 NET_ERROR(INCOMPLETE_SPDY_HEADERS, -347)
 
+// No PAC URL configuration could be retrieved from DHCP. This can indicate
+// either a failure to retrieve the DHCP configuration, or that there was no
+// PAC URL configured in DHCP.
+NET_ERROR(PAC_NOT_IN_DHCP, -348)
+
 // The cache does not have the requested entry.
 NET_ERROR(CACHE_MISS, -400)
 
 // Unable to read from the disk cache.
 NET_ERROR(CACHE_READ_FAILURE, -401)
 
 // ****NOTE THAT code -402 is available****
 
 // The operation is not supported for this entry.
 NET_ERROR(CACHE_OPERATION_NOT_SUPPORTED, -403)
@@ skipping 65 matching lines @@
 // Import failed - certificate already exists in database.
 // Note it's a little weird this is an error but reimporting a PKCS12 is ok
 // (no-op).  That's how Mozilla does it, though.
 NET_ERROR(IMPORT_CERT_ALREADY_EXISTS, -704)
 
 // CA import failed due to some other error.
 NET_ERROR(IMPORT_CA_CERT_FAILED, -705)
 
 // Server certificate import failed due to some internal error.
 NET_ERROR(IMPORT_SERVER_CERT_FAILED, -706)