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The change makes all proto fields optional, and slightly simplifies the
decoding logic.

CookieChangeSubscription::Serialize() sets all the proto's fields, so
the change is only relevant for corrupt protos. In this case, proto3
will report default values for missing fields.

The change is compatible with previously written data, as proto2 and
proto3 use the same on-disk format.

Bug: 729800
Change-Id: I06b08ce003b571b716bccd540fa15918ea925bb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036393Reviewed-by: Ayu Ishii <ayui@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737905}