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

net/udp/udp_socket_win.h

Index: net/udp/udp_socket_win.h
diff --git a/net/udp/udp_socket_win.h b/net/udp/udp_socket_win.h
index 28b7d4ae6699e172df6adc0a486cc98f4ba8d230..7ccb73f64f91fd0c6d751a926b481138f49ba043 100644
--- a/net/udp/udp_socket_win.h
+++ b/net/udp/udp_socket_win.h
@@ -95,10 +95,12 @@ class NET_EXPORT UDPSocketWin : NON_EXPORTED_BASE(public base::NonThreadSafe) {
              const CompletionCallback& callback);
 
   // Set the receive buffer size (in bytes) for the socket.
-  bool SetReceiveBufferSize(int32 size);
+  // Returns a net error code.
+  int SetReceiveBufferSize(int32 size);
 
   // Set the send buffer size (in bytes) for the socket.
-  bool SetSendBufferSize(int32 size);
+  // Returns a net error code.
+  int SetSendBufferSize(int32 size);
 
   // Returns true if the socket is already connected or bound.
   bool is_connected() const { return socket_ != INVALID_SOCKET; }