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This usage breaks when Custom Elements v0 is turned off, so this
CL updates to a ElementCreationOptions object.

Existing tests, plus the work [1] to remove custom elements v0
for WebUI, should catch issues with this change.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2512381

Bug: 1110954
Change-Id: Ia44ce07366edd34d916d78c93ab5c0b786ba223b
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519385
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824545}