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Expose some methods in nsIContentUtils for attributes.

Gabriel Ivăncescu requested to merge insn/wine-gecko:content-utils into master

These methods will be useful when implementing the MutationObserver and observing attribute changes. In nsIMutationObserver (AttributeChanged and AttributeSetToCurrentValue) converting nsAttrValue to string is needed to obtain its old value, and GetNamespaceURI to obtain its namespace URI string from the namespaceID.

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