[Background Fetch] Move CORS preflight check to the controller. #13262
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Bug: 889888
Change-Id: I2429361627ffea2e1b8d5a11eb0e34b0cbfa1abb
Reviewed-on: https://chromium-review.googlesource.com/c/1249265
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596707}