Bug 1465794 [wpt PR 11274] - Worker: Change the default credentials option from ...

Bug 1465794 [wpt PR 11274] - Worker: Change the default credentials option from 'omit' to 'same-origin', a=testonly

Automatic update from web-platform-testsWorker: Change the default credentials option from 'omit' to 'same-origin'

This is a follow-up for the spec change:
https://github.com/whatwg/html/pull/3656

Note that ES Modules for dedicated workers is still behind the flag and this
change doesn't affect applications in the real world.

Bug: 848247
Change-Id: I25083f3f11f9d13663e16e2f4c137095e9b12b01
Reviewed-on: https://chromium-review.googlesource.com/1080668
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563465}

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wpt-commits: 72c7cfed684554c0d65b7a33d413df9ae1c5999f
wpt-pr: 11274