function finalizeMeasurement(id) {
        if (activeTests[id.id]) {
            delete activeTests[id.id];
        }

        if (updatableTests[id.id]) {
            delete updatableTests[id.id];
        }
    }
Remove timer from lists so next action starts a new measurement

updateMeasurement may not have been called, so timer may be
in either or neither list, but should never be in both.

@param {Object} id  Timer id.