Bug 1473870 [wpt PR 11470] - custom-elements: Element created by createElementNS...

Bug 1473870 [wpt PR 11470] - custom-elements: Element created by createElementNS(ns, qname, options) with valid custom element name and undefined options should be upgraded immediately, a=testonly

Automatic update from web-platform-testscustom-elements: Element created by createElementNS(ns, qname, options) with valid custom element name and undefined options should be upgraded immediately

createElementNS(XHTML_NS, 'my-element', undefined) was not being
upgraded immediatedly, though both createElementNS(XHTML_NS,
'my-element') and createElementNS(XHTML_NS, 'my-element', {}) were.

Bug: 841725
Change-Id: Iccc4f0e98b1de65288381dd9ac106e71bfc5d0c8
Reviewed-on: https://chromium-review.googlesource.com/1096812
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566374}

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wpt-commits: 05c1a1fb132cc0e37f49c8eb1a5df096098f35be
wpt-pr: 11470