Bug 1630915 [wpt PR 23052] - Fix unintentional case-sensitivity for COEP header parsi...

Bug 1630915 [wpt PR 23052] - Fix unintentional case-sensitivity for COEP header parsing, a=testonly

Automatic update from web-platform-tests
Fix unintentional case-sensitivity for COEP header parsing

https://crrev.com/c/2132902 introduced case-sensitivity unintentionally.
Fix it.

Having a test for COEP header parsing for responses coming from service
workers in reporting.https.html is not good. Create a separate test
file and remove the corresponding test case from reporting.https.html.

Bug: 887967
Change-Id: I50da8ee5e38162fbb81699fc1c55f5b4cb9cd903
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154364
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760391}

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wpt-commits: 1eaf296e2efa00f24f62b34122a1950ca9f28f1e
wpt-pr: 23052