Return a soft error when we detect the 3rd party problem causing bug 27870.

net/base/net_error_list.h

 // Copyright (c) 2010 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 contains the list of network errors.
 
 //
 // Ranges:
 //     0- 99 System related errors
 //   100-199 Connection related errors
@@ skipping 122 matching lines @@
 // The SOCKS proxy server failed establishing connection to the target host
 // because that host is unreachable.
 NET_ERROR(SOCKS_CONNECTION_HOST_UNREACHABLE, -121)
 
 // There is no more data left in the logical stream.
 NET_ERROR(END_OF_STREAM, -122)
 
 // The peer sent an SSL no_renegotiation alert message.
 NET_ERROR(SSL_NO_RENEGOTIATION, -123)
 
+// Winsock sometimes reports more data written than passed.  This is probably
+// due to a broken LSP.
+NET_ERROR(WINSOCK_UNEXPECTED_WRITTEN_BYTES, -124)
+
 // Certificate error codes
 //
 // The values of certificate error codes must be consecutive.
 
 // The server responded with a certificate whose common name did not match
 // the host name.  This could mean:
 //
 // 1. An attacker has redirected our traffic to his server and is
 //    presenting a certificate for which he knows the private key.
 //
@@ skipping 188 matching lines @@
 // internal error returned from the HttpCache to the HttpCacheTransaction that
 // tells the transaction to restart the entry-creation logic because the state
 // of the cache has changed.
 NET_ERROR(CACHE_RACE, -406)
 
 // The server's response was insecure (e.g. there was a cert error).
 NET_ERROR(INSECURE_RESPONSE, -501)
 //
 // The FTP PASV command failed.
 NET_ERROR(FTP_PASV_COMMAND_FAILED, -600)