Re: [w3c/webcomponents] Polymer encouraged incorrect document.createElement() usage (#544)

Blink implements an old draft of the custom elements spec where that option is a DOMString. Our implementation of custom elements "v1" and that old stuff are basically separate. We won't support interpreting that second argument as a string when creating customized built-in elements in V1 and will deprecate that along with document.registerElement and the rest of the old implementation.

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