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

net/base/net_error_list.h

Index: net/base/net_error_list.h
diff --git a/net/base/net_error_list.h b/net/base/net_error_list.h
index 37c84c7f2a234e1e8e7ca3bc895b3e80bf4be257..29b2ab55544d6c1282f1a3df8aecb38c9dd1f4d7 100644
--- a/net/base/net_error_list.h
+++ b/net/base/net_error_list.h
@@ -313,12 +313,20 @@ 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.