6645856: static field XWindowPeer.defaultFont hides XWindow.defaultFont
Summary: unnedded code has been removed. Added getter for XWindow.defaultFont to initialize it lazily.
Reviewed-by: dav
6645885: small refactoring for XContentWindow
Summary: move createContent() method from XDecoratedPeer to XContentWindow, so only XContentWindow keep information about the way we position it.
Reviewed-by: anthony