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This reverts part of the code in commit 57f97b28.

The reason is that, based on mmenke@'s comment in crrev/c/2570123,
copying the whole set once per saved cookie for comparison is generally
not worth the overhead, should use an enum class object instead.

Bug: 1136102
Change-Id: I3bcc07a84d64e8ce55fb999567e154fdbfe43443
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580461Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Lily Chen <chlily@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Shuran Huang <shuuran@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836730}