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Form-associated custom elements: ElementInternals methods should throw NotSupportedError instead of InvalidStateError

to match to the latest specification pull request [1].
Also, 'labels' attribute should throw a NotSupportedError.

[1] https://github.com/whatwg/html/pull/4383

Change-Id: Ie1679e0746d72d5f2c06423eba70d8f570b61911
Bug: 905922
Reviewed-on: https://chromium-review.googlesource.com/c/1491055
Commit-Queue: Kent Tamura <tkent@chromium.org>
Commit-Queue: Hayato Ito <hayato@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635895}