[w3c/webcomponents] slotchange not firing for changes to single child TextNode (#592)

I want to detect changes to a slot by listening to the `slotchange` event.  My slot element only contains a single line of text, and so just a single text node.  When I update the host element's innerHTML with a new, different single line of text, I expect that a `slotchange` event should fire, but it doesn't.

If I change a host element's innerHTML from `123\n 456` to `567\n 89`, a `slotchange` event does fire, as I'd expect. 

I'm not sure if this is a bug? feature? in Chromium (53.0.2785.143)... or something about how `slotchange` is related to Mutation Observers in the spec, so I figured I'd file it here.

An example of this: https://jsbin.com/xivunad/15/edit?html,js,console,output

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https://github.com/w3c/webcomponents/issues/592