Re: [whatwg/dom] cancelBubble legacy property (#211)

In Blink it's a separate internal slot, and used in two places:
https://chromium.googlesource.com/chromium/src/+/aede1d0909b3f905c74c769e610b903015f50569/third_party/WebKit/Source/core/events/EventDispatcher.cpp#179
https://chromium.googlesource.com/chromium/src/+/4e4da03f08faa602998125895ac4b884c60be001/third_party/WebKit/Source/modules/indexeddb/IDBEventDispatcher.cpp#36

@inexorabletash, any idea why there's special event dispatch code for IndexDB?

If we end up having to specify something by the name `cancelBubble` it would be strange if it affected things outside the bubbling phase, but it might be worth measuring how often `cancelBubble` is actually set to true. @RByers, could you do a quick httparchive query to see how it's usually used to see if that's even worth investigating?

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