[rfc][icedtea-web] Stop supporting old version of NPAPI for 1.4

[Adam Domurad]

Hi. This was briefly discussed with Deepak, and by the time 1.4 is
released, there will be no need to support the versions of firefox that
have the old api. 

We need not apply this patch right away, but it does make the code nicer
to deal with and reason about.

Note about backporting: we will probably have to continue to backport
changes so they work with both #if cases. Changes that require different
behaviour for both should be rare though. It may make patches a little
harder to apply, but should generally only affect line offsets.

Thanks,
Adam
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