make SetReceiveBufferSize and SetSendBufferSize return net error codes (instead of bools)

net/base/net_error_list.h

 // Copyright (c) 2012 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 values.
 
 // This file contains the list of network errors.
 
 //
@@ skipping 295 matching lines @@
 // The SSL server indicated that an unnecessary TLS version fallback was
 // performed.
 NET_ERROR(SSL_INAPPROPRIATE_FALLBACK, -157)
 
 // Certificate Transparency: All Signed Certificate Timestamps failed to verify.
 NET_ERROR(CT_NO_SCTS_VERIFIED_OK, -158)
 
 // The SSL server sent us a fatal unrecognized_name alert.
 NET_ERROR(SSL_UNRECOGNIZED_NAME_ALERT, -159)
 
-// Failed to set or change the socket's receive buffer size as requested
+// Failed to set the socket's receive buffer size as requested.
 NET_ERROR(SOCKET_SET_RECEIVE_BUFFER_SIZE_ERROR, -160)
 
-// Failed to set or change the socket's send buffer size as requested.
+// Failed to set the socket's send buffer size as requested.
 NET_ERROR(SOCKET_SET_SEND_BUFFER_SIZE_ERROR, -161)
 
+// Failed to set the socket's receive buffer size as requested, despite success
+// return code from setsockopt.
+NET_ERROR(SOCKET_RECEIVE_BUFFER_SIZE_UNCHANGEABLE, -162)
+
+// Failed to set the socket's send buffer size as requested, despite success
+// return code from setsockopt.
+NET_ERROR(SOCKET_SEND_BUFFER_SIZE_UNCHANGEABLE, -163)
+
 // 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 394 matching lines @@
 NET_ERROR(DNS_TIMED_OUT, -803)
 
 // The entry was not found in cache, for cache-only lookups.
 NET_ERROR(DNS_CACHE_MISS, -804)
 
 // Suffix search list rules prevent resolution of the given host name.
 NET_ERROR(DNS_SEARCH_EMPTY, -805)
 
 // Failed to sort addresses according to RFC3484.
 NET_ERROR(DNS_SORT_ERROR, -806)