"report the exception" is missing in setTimeout(function(){})

[hiroshige-g]

Step 7.2 of https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timer-initialisation-steps says "Invoke the Function." but doesn't call https://html.spec.whatwg.org/multipage/webappapis.html#report-the-exception, i.e. setTimeout(function(){throw new Error();}) doesn't fire global object's error events.

Given that:

• setTimeout("throw new Error();"); triggers #report-the-exception (from https://html.spec.whatwg.org/multipage/webappapis.html#run-a-classic-script)
• Browsers fire global object's error events both for setTimeout(function) and setTimeout(string) cases, as observed in https://wpt.fyi/results/html/webappapis/scripting/events/event-handler-processing-algorithm-error/window-runtime-error.html?label=experimental&label=master&aligned and https://wpt.fyi/results/workers/interfaces/WorkerGlobalScope/onerror/exception-in-onerror.html?label=experimental&label=master&aligned
• Some of other callers of Invoke explicitly call #report-the-exception when Invoke throws.

#report-the-exception is needed here. I'm preparing a PR.