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This CL converts the PeopleHandler unittests away from SignManager and
ProfileOAuth2TokenService, in favor of the new IdentityManager.

Production code has been converted in [1]. This is a follow up steps.

[1] https://crrev.com/c/1261637

BUG=890810

Change-Id: I405e46d2126180a2da61393bf32263ae43877b6b
Reviewed-on: https://chromium-review.googlesource.com/c/1311093Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#604377}