merge_pr_28197
Access-Control-Allow-Headers is added for CORS preflight and should be removed according to the spec (https://w3c.github.io/ServiceWorker/#update-algorithm). Bug: 1191514 Change-Id: Ide3c8556bf3a53d51f26d5f9be34af3b873922be Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2782391 Reviewed-by: Ben Kelly <[email protected]> Commit-Queue: Ghazale Hosseinabadi <[email protected]> Cr-Commit-Position: refs/heads/master@{#866130}