[whatwg/dom] Catch errors while upgrading customized built-in elements (#797)

Closes https://github.com/whatwg/html/issues/5084. /cc @tkent-google @bzbarsky and also @mfreed7 since he's been working on custom element bugs in Chromium recently.

This needs tests; maybe one of you all would be able to adapt the code in https://github.com/whatwg/html/issues/5084 into such tests? Be sure to test the question as to whether the element retains its identity or not.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/797

-- Commit Summary --

  * Catch errors while upgrading customized built-in elements

-- File Changes --

    M dom.bs (19)

-- Patch Links --

https://github.com/whatwg/dom/pull/797.patch
https://github.com/whatwg/dom/pull/797.diff

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