Set detail to null by default to comply with the spec
#51685
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Summary:
Changelog: [Internal]
This is required by the spec:
performance.mark: https://w3c.github.io/user-timing/#the-performancemark-constructor, see step 7.performance.measure: https://w3c.github.io/user-timing/#dom-performance-measure, see step 9.Differential Revision: D75611976