No longer allow a policy exception just for workers

[annevk]

In particular, if you can execute script, you can execute a worker. Making workers an optional feature is not actually something user agents implement and has led to implementer confusion, e.g., web-platform-tests/wpt#41758.

• At least two implementers are interested (and none opposed):
  • Gecko
  • WebKit
• Tests are written and can be reviewed and commented upon at:
  • N/A
• Implementation bugs are filed:
  • Chromium: N/A
  • Gecko: N/A
  • WebKit: N/A
• MDN issue is filed: N/A

(See WHATWG Working Mode: Changes for more details.)

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/workers.html ( diff )

[annevk]

@youennf @allstarschh @smaug---- @hiroshige-g does this seem reasonable?

[smaug----]

Oh, the pr is about removing those exceptions which no one throws? I thought this was something very different based on the title :)

Seems fine

[annevk]

Note to reviewers: if you want to merge this, please adjust the commit title as per the PR title change.