Remove deprecated allowpaymentrequest attribute

[marcoscaceres]

Plan is to remove it from the platform:

Payment Request: w3c/payment-request#928
HTML: whatwg/html#5915

Updated tests: web-platform-tests/wpt#25559

[marcoscaceres]

Re: IPR, I applied to be a IE for the group. Not sure who the team contact is? @sideshowbarker can maybe press the right button?🙏

[sideshowbarker]

Re: IPR, I applied to be a IE for the group. Not sure who the team contact is? @sideshowbarker can maybe press the right button?🙏

I think we need @wseltzer for this

[marcoscaceres]

Blocked on whatwg/html#5915

[marcoscaceres]

Updated tests web-platform-tests/wpt#25559

[danyao]

@clelland WDYT?

[clelland]

+1 to remove this; it was specced just before feature policy became a thing.

I saw "blocked on" above, so held off the review. Since that's landed, I'll merge this now.

Thanks, @marcoscaceres

[clelland]

@wseltzer, is there something to do to placate ash-nazg here? I've revalidated, but the computer still says no.

[wseltzer]

Marked as non substantive for IPR from ash-nazg.

[wseltzer]

I marked it as non-substantive, as it doesn't add IPR surface.

[clelland]

It removes some, so I wasn't sure if that counted just as much.

Thanks for unblocking that, @wseltzer!