8041772: (ch) PendingFuture.CANCELLED has backtrace that potentially keeps objects alive

[Alan Bateman]

This is an issue that Zhong Yu pointed out recently [1]. Easily fixed by 
removing the static field and creating the CancellationException when 
the cancel method is called:
   http://cr.openjdk.java.net/~alanb/8041772/webrev/

I don't propose to include a test with this specific patch, instead I'd 
prefer to add a more general test that is long running to ensure that 
there aren't any unnecessary objects retained.

-Alan.

[1] http://mail.openjdk.java.net/pipermail/nio-dev/2014-April/002614.html
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