fix: canShare() return false if not allowed to use

[marcoscaceres]

For normative changes, the following tasks have been completed:

• Modified Web platform tests

Implementation commitment:

• WebKit (https://bugs.webkit.org/show_bug.cgi?id=214448)
• Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=1251175)
• Gecko (https://phabricator.services.mozilla.com/D90834)

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[saschanaz]

Good catch 👍

[saschanaz]

Do we have WPT for this BTW?

[marcoscaceres]

I'll add one. No problem.

[saschanaz]

BTW I'm not sure what the enum version of canShare be look like, if canShare covers more than just data check 🤔

[marcoscaceres]

Added/fixed test:
web-platform-tests/wpt#30868

BTW I'm not sure what the enum version of canShare be look like, if canShare covers more than just data check 🤔

Happy to build on that aspect incrementally as a followup.

Irrespective, I think it would be confusing for ".canShare(x)" return true and then calling .share() to fail. That would not be great. This keeps them in sync.