* gnu/java/nio/FileLockImpl.java
(finalize): Made protected.
* java/nio/channels/FileChannel.java
(MapMode.READ_ONLY): Made final.
(MapMode.READ_WRITE): Made final.
(MapMode.PRIVATE): Made final.
* java/nio/channels/SocketChannel.java
(open): Simplified code.
* java/nio/channels/spi/AbstractSelectableChannel.java
(registered): Unused, removed.
(keyFor): Check channel is open, only locate key
and not add a new one.
(register): Don't delete attachments.
From-SVN: r78519
