Make Content-Type CORS request check stronger #29701
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If a Content-Type request header contains multiple comma separated
value, this change makes sure to check that all of them are safelisted
and otherwise triggers a CORS preflight.
Bug: 1155640
Change-Id: I75f5d1e4a51b876caea102de5c26afb5bfa090d1
Reviewed-on: https://chromium-review.googlesource.com/3031304
WPT-Export-Revision: bd4190b49ef22b1f1195a76d440f323490b68704