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

net/udp/datagram_server_socket.h

Index: net/udp/datagram_server_socket.h
diff --git a/net/udp/datagram_server_socket.h b/net/udp/datagram_server_socket.h
index a7191d12c02ffc1e36641c5a086bdc202c108a92..964883fa5b2415f23d369a7a30927efaa012247d 100644
--- a/net/udp/datagram_server_socket.h
+++ b/net/udp/datagram_server_socket.h
@@ -56,10 +56,12 @@ class NET_EXPORT DatagramServerSocket : public DatagramSocket {
                      const CompletionCallback& callback) = 0;
 
   // Set the receive buffer size (in bytes) for the socket.
-  virtual bool SetReceiveBufferSize(int32 size) = 0;
+  // Returns a net error code.
+  virtual int SetReceiveBufferSize(int32 size) = 0;
 
   // Set the send buffer size (in bytes) for the socket.
-  virtual bool SetSendBufferSize(int32 size) = 0;
+  // Returns a net error code.
+  virtual int SetSendBufferSize(int32 size) = 0;
 
   // Allow the socket to share the local address to which the socket will
   // be bound with other processes. Should be called before Listen().