Compute storage keys to be stored on environments. (#142)

[wanderview]

• [ ] At least two implementers are interested (and none opposed):
  • …
  • …
• [ ] Tests are written and can be reviewed and commented upon at:
  • …
• [ ] Implementation bugs are filed:
  • Chrome: …
  • Firefox: …
  • Safari: …

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

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[wanderview]

See also: https://github.com/whatwg/html/pull/7940

[wanderview]

I think this PR is based on an old approach and is defunct.