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

I don't know well about Blink's implementation of event dispatching and need investigation on #334.

> we lookup the global once and then use it throughout?

IIUC, it wouldn't make much sense for window.event.

```
eventTargetInContextX.addEventListener(type, funcInContextA, false);
eventTargetInContextX.addEventListener(type, funcInContextB, false);
```

We'd like both of `funcInContextA` and `funcInContextB` to observe their own `window.event`, right?  Then, we need to use the listener's global object, I think.  I'm supposing the following use case.

```
function funcInContextA() {
    event;  // => window.event
}
```

Given that this is a typical use case (and why we want to support window.event), then it should be the listener function's associated global object.

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