[Gecko Bug 1709232] Make PerformanceObserver.supportedEntryTypes respects dom.enable_event_timing #28845
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PerformanceObserver.supportedEntryTypes doesn't check whether
PerformanceEventTiming is enabled or not, so it'll falsely claims
PerformanceEventTiming is supported even if the pref is disabled.
This patch fixes that by adding a guard to it.
Differential Revision: https://phabricator.services.mozilla.com/D114250
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1709232
gecko-commit: 809f11778c3990c3eab0d284b298620d0121ea77
gecko-reviewers: emilio