[rfc][icedtea-web][policyeditor] Reduced usage of weak references

[Andrew Azores]

Hi,

This patch reduces the usage of weak references in PolicyEditor and 
CustomPolicyViewer. There is still one use of a weak reference left, 
used when closing PolicyEditor and answering 'Yes' to saving changes 
first. In this case, the "Changes Saved" dialog appears after the editor 
has been closed and disposed, but the dialog holds a reference to it. 
This results in the JVM not exiting after PolicyEditor is closed. Using 
the weak reference in the way it's still used here allows for the JVM to 
properly exit once the editor is closed, while still allowing the dialog 
to be modal when it is shown in situations where the editor is not 
already closed.

ChangeLog:
* netx/net/sourceforge/jnlp/security/policyeditor/CustomPolicyViewer.java
(weakThis): removed
* netx/net/sourceforge/jnlp/security/policyeditor/PolicyEditor.java
(weakThis): used only in showChangesSavedDialog, other uses changed to 
PolicyEditor.this

Thanks,

-- 
Andrew A

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