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This change is part of a larger cleanup effort to make the bare
CanonicalCookie constructor private. The factory method, FromStorage,
is used for loading cookies that have already entered the user agent's
storage model into a CanonicalCookie.

Bug: 1102874
Change-Id: Iaef8b2773e596c72073dc8bce61f6fd8253d0a66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2504089Reviewed-by: Lily Chen <chlily@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Dylan Cutler <dylancutler@google.com>
Cr-Commit-Position: refs/heads/master@{#821748}