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

net/socket/buffered_write_stream_socket.cc

Index: net/socket/buffered_write_stream_socket.cc
diff --git a/net/socket/buffered_write_stream_socket.cc b/net/socket/buffered_write_stream_socket.cc
index 87d3c337e24ac88deb19e34bb4b19c9ae835380f..232cfe71defb2f0da6720355fd51b24e12ad2d49 100644
--- a/net/socket/buffered_write_stream_socket.cc
+++ b/net/socket/buffered_write_stream_socket.cc
@@ -59,11 +59,11 @@ int BufferedWriteStreamSocket::Write(IOBuffer* buf, int buf_len,
   return buf_len;
 }
 
-bool BufferedWriteStreamSocket::SetReceiveBufferSize(int32 size) {
+int BufferedWriteStreamSocket::SetReceiveBufferSize(int32 size) {
   return wrapped_socket_->SetReceiveBufferSize(size);
 }
 
-bool BufferedWriteStreamSocket::SetSendBufferSize(int32 size) {
+int BufferedWriteStreamSocket::SetSendBufferSize(int32 size) {
   return wrapped_socket_->SetSendBufferSize(size);
 }