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Display a warning message in the console when SameSiteByDefaultCookies
is enabled and a cookie without a SameSite attribute (which is defaulted
into Lax mode) gets sent on a request with an unsafe method. (This will
happen if the cookie is less than 2 minutes old, as a temporary
intervention to avoid breaking POST-based auth flows.)

Bug: 990439
Change-Id: I0776acb18c829c06cfc2eab7d5a69da05a6c44d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779278Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693018}