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

net/socket/socks5_client_socket.cc

Index: net/socket/socks5_client_socket.cc
diff --git a/net/socket/socks5_client_socket.cc b/net/socket/socks5_client_socket.cc
index 777ce0c26a16329e2a2c8cd9ad2e88a932516579..681f73f26e983f824567c7a2561d72fc10d6fe64 100644
--- a/net/socket/socks5_client_socket.cc
+++ b/net/socket/socks5_client_socket.cc
@@ -183,11 +183,11 @@ int SOCKS5ClientSocket::Write(IOBuffer* buf, int buf_len,
   return rv;
 }
 
-bool SOCKS5ClientSocket::SetReceiveBufferSize(int32 size) {
+int SOCKS5ClientSocket::SetReceiveBufferSize(int32 size) {
   return transport_->socket()->SetReceiveBufferSize(size);
 }
 
-bool SOCKS5ClientSocket::SetSendBufferSize(int32 size) {
+int SOCKS5ClientSocket::SetSendBufferSize(int32 size) {
   return transport_->socket()->SetSendBufferSize(size);
 }