Re: [whatwg/dom] Standardize srcElement, returnValue, and window.event (#334)

For [NotEnumerable] for window.event, I have no evidence, but I guess that `window.event` was not standardized, so Blink didn't want to list up the property in case of enumeration, i.e. Blink wanted to make it a kind of a hidden property because the spec expected Blink to not have window.event.  I think that we can remove [NotEnumerable] as window.event is now spec'ed.

For which global object Blink is using, I'm not 100% sure, but it looks like Blink is using the global object associated with the EventTarget.  I tried to track down where the global object comes from, and reached here:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/dom/events/EventTarget.cpp?rcl=8f0f9ceb2c3f5acf36ef55d620d3f0e6ea7d8d01&l=748
My code reading could be wrong, but I guess that Blink uses the EventTarget => its Document (or Worker) => its Window (or Worker).

For node movement during event dispatch, I know nothing, but I think that it's possible that the behavior was implemented without deep thoughts.  Maybe Blink should fix it, too.


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