Removal of two instances of synchronization on Boolean

[Adam Domurad]

Hello all. Tiny patch here to remove two instances of synchronization on
Boolean (considered bad practice as typically only two Boolean objects
exist).

While I was not entirely sure what should be done about the Boolean
synchronization, Deepak's opinion was that the synchronization was not
needed, so I submitted this small patch.
2012-05-17  Adam Domurad  <adomurad at redhat.com>

        * plugin/icedteanp/java/sun/applet/PluginStreamHandler.java:
Removed 
        unnecessary synchronization on Boolean (dangerous) for code that
did
        not require synchronization.
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