chromeos_smart_card_connector
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[WIP] Handle more Xhrio failures
Detect cases in KnownAppsRegistry when goog.net.XhrIo reports isSuccess()==true, but at the same time getResponseText()==''. As it turned out, this is also a possible way of signaling an error from XhrIo.
This is a generic cleanup, since in production we don't expect any errors happening there (because the fetched URL belong to our own CRX).