[whatwg/fetch] Response's trailer cannot use [SameObject] (#488)

Since an attribute that returns a promise can be made to return a
rejecting promise as well. (We really need [Cached] or some such.)

Tests: https://github.com/w3c/web-platform-tests/issues/4811.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/488

-- Commit Summary --

  * Response's trailer cannot use [SameObject]

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/488.patch
https://github.com/whatwg/fetch/pull/488.diff

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