Bug 1581712 [wpt PR 19108] - Move 'autofocus' IDL attribute to HTMLOrSVGElement,...

Bug 1581712 [wpt PR 19108] - Move 'autofocus' IDL attribute to HTMLOrSVGElement, a=testonly

Automatic update from web-platform-tests
Move 'autofocus' IDL attribute to HTMLOrSVGElement

crrev.com/697042 changed the autofocus behavior, and this CL just changes
the IDL attribute.

Note: We need to add 'autofocus' to svg_attribute_names.json5
because generated code for 'Reflect' needs svg_names::kAutofocusAttr.
html_names::kAutofocusAttr and svg_names::kAutofocusAttr have
an identical value.

I2IS: https://groups.google.com/a/chromium.org/d/msg/blink-dev/g8MP8KUf96w/360rLewrDwAJ

Bug: 995679
Change-Id: I4c7a1ad72d14c4e1e54d8455935b1255805fb384
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808617
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697087}

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wpt-commits: f2835bb68cb99f89d89a7aa863f47d7219f5f177
wpt-pr: 19108