Patch to allow sharing of classloader between extentions

[Deepak Bhole]

JNLP files allow loading of child jnlps via the extension element.
Currently, the classloader used by these child jnlps is different than
the one used by the parent. When a resource request comes in, the loader
and its children are searched. In theory this should work, but many
applets don't like it. For example:

http://javafx.com/samples/SwirlingSquares/webstart/SwirlingSquares.jnlp

Attached patch makes it so that the same loader is shared. This is not an
ideal fix, but more of a workaround to let other applets work. It does not 
break any existing loading mechanism AFAIK, and allows a set of applets 
that didn't work before, to work.

Thoughts?

Cheers,
Deepak
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