Added CookieMonsterTest::CookieSorting().
Added CookieMonsterTest::CookieSorting().

Adding unit test to capture current re-setting behavior and it's
affect on cookie sorting.

Review URL: https://codereview.chromium.org/1305163005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#345742}

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