Re: [whatwg/dom] Standardize certain Microsoft event extensions (#334)

Some issues with `window.event`:

* Chrome has (non-standard) [NotEnumerable] in IDL meaning `Object.getOwnPropertyDescriptor()` returns the wrong thing there. Is that something that can be removed by Chrome or do we need it in the standard?
* It's a little bit unclear where the global is gotten from. I thought it was related to the target/currentTarget, but https://cs.chromium.org/chromium/src/third_party/WebKit/Source/bindings/core/v8/V8AbstractEventListener.cpp?q=V8AbstractEventListener::InvokeEventHandler&sq=package:chromium&l=135 suggests it's global state. Does that correspond to the "current global object" concept or is it something else? From the test cases I assumed it was somehow related to currentTarget, since if you move nodes in the path between documents you can get the global whose `.event` is set to change as well. But maybe that's just how callbacks work and I'm a little confused.

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