SVGPaint::setPaint parameters

The current definition for the DOMString parameters of setPaint are:
in DOMString uri ..., or null.
in DOMString rgbColor ...., or null.
in DOMString iccColor ..., or null.

They should be:
in DOMString uri ..., or empty string.
in DOMString rgbColor ...., or empty string.
in DOMString iccColor ..., or empry string.
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