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This method is meant for cases where we want to copy the properties of
an existing cookie already in the cookie store to another
instance of CanonicalCookie.

Bug: 1102874
Change-Id: I1ab8f732538e4e33bc8a3a350ee547962bf36850
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2452969
Commit-Queue: Dylan Cutler <dylancutler@google.com>
Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814539}