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SECURITY: Don't allow directly calling Xml::isWellFormed

Description

SECURITY: Don't allow directly calling Xml::isWellFormed

Changing Xml::isWellFormed to private. In WMF hosted repos, there are
no callers to isWellFormed directly.

Bug: T85848
Change-Id: I104427989b89c386de571b8e60642095331a1132