[RFC][plugin]: fix fixme

[Denis Lila]

Hi.

This patch implements the fixme in PluginObjectStore
using the "wrapped" idea in that comment. It also
synchronizes modifications to the 3 hash maps because,
afaics, they can be called concurrently.

ChangeLog:
+2011-03-30  Denis Lila  <dlila at redhat.com>
+
+	* plugin/icedteanp/java/sun/applet/PluginObjectStore.java
+	(wrapped): New static variable.
+	(getNextID): New function.
+	(reference): Using getNextID and synchronized.
+	(unreference): Synchronized.
+	(dump): Improve iteration.

Any criticism is always welcome.

Thank you,
Denis.
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