Bug 1531256 [wpt PR 15516] - custom-elements: Update CustomElementReg…

…istry.html for 'disabledFeatures'., a=testonly

Automatic update from web-platform-tests
custom-elements: Update CustomElementRegistry.html for 'disabledFeatures'.

This change is for whatwg/html#4324, and
a follow-up of web-platform-tests/wpt#15123

Bug: crbug.com/905922
Change-Id: I3eceb5d21ab555c23ed877ded17d359fe004e2aa
Reviewed-on: https://chromium-review.googlesource.com/c/1482361
Auto-Submit: Kent Tamura <tkentchromium.org>
Reviewed-by: Hayato Ito <hayatochromium.org>
Commit-Queue: Kent Tamura <tkentchromium.org>
Cr-Commit-Position: refs/heads/master{#635380}

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wpt-commits: 1aa5413b0c0a03d3c93e07d18bf8cc78e19ca611
wpt-pr: 15516

UltraBlame original commit: e89bf41687f50e862ace8bb7077aaa06e2f6a8b9