[OpenJDK 2D-Dev] Remove warnings in sun.java2d

[Roman Kennke]

I looked through the classes in sun.java2d and removed most warnings
there. That is, unused imports, @Override annotations, local variables
hiding fields, static field access through an instance, redundant casts
and maybe something else I forgot.

Find the patch attached.

/Roman

-- 
http://kennke.org/blog/
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