Remove ReduceAcceptLanguage origin trial and add deprecation trial 1. This CL intend to remove the first-party ReduceAcceptLanguage origin trial which was introduced by https://crrev.com/c/3932979 years ago. 2. To support experiment the ReduceAcceptLanguage, we also add supports first part and third party deprecation origin trial for this feature. * Same origin: We support most cases (subresource, iframe, etc) of same origin deprecation trial. Also, to make the first request work, sites can send the critical-origin-trial header. * Cross origin: For cross origin iframe deprecation origin trial, site need to register first-part deprecation origin trial. For subresource, sites can use JavaScript to inject the origin-trial meta tag. * Same origin redirect: The expected behavior will happen in the second request, e.g. if the first request opt-in the deprecation origin trial, starting the second request we won't send reduced accept-language. * Cross origin redirect: The deprecation origin trial won't work when a.com redirects to b.com and only a.com opt-in the deprecation origin, because persistent origin trials only parse and persist tokens for commit origin which is b.com in this case. Change-Id: Ia1fda573bb0279a4b976a7a3b8455bdcb809fcce Bug: 334954143 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5582436 Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org> Commit-Queue: Victor Tan <victortan@chromium.org> Reviewed-by: Andrew Williams <awillia@chromium.org> Reviewed-by: Maks Orlovich <morlovich@chromium.org> Reviewed-by: Daniel Cheng <dcheng@chromium.org> Cr-Commit-Position: refs/heads/main@{#1314865}
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