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

net/socket/tcp_client_socket.cc

Index: net/socket/tcp_client_socket.cc
diff --git a/net/socket/tcp_client_socket.cc b/net/socket/tcp_client_socket.cc
index 22aea47778b75c9060b8e65be924ec9c35a62b4e..53d8d1fe25907c7a0de2d1655849687f578d1e1b 100644
--- a/net/socket/tcp_client_socket.cc
+++ b/net/socket/tcp_client_socket.cc
@@ -269,11 +269,11 @@ int TCPClientSocket::Write(IOBuffer* buf,
   return result;
 }
 
-bool TCPClientSocket::SetReceiveBufferSize(int32 size) {
+int TCPClientSocket::SetReceiveBufferSize(int32 size) {
   return socket_->SetReceiveBufferSize(size);
 }
 
-bool TCPClientSocket::SetSendBufferSize(int32 size) {
+int TCPClientSocket::SetSendBufferSize(int32 size) {
     return socket_->SetSendBufferSize(size);
 }