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The logic to check whether an account is managed was duplicated many
times in the code. This CL factors it in a helper function.

This should be a pure refactoring, and should not change the behavior.

Fixed: 1122496
Change-Id: I32e09af11ecc1169b2d704a5c4552e7f17f8ec7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570569Reviewed-by: Alex Ilin <alexilin@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836079}