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It was introduced by https://codereview.chromium.org/10344009 for
keychain reauthorization, now that keychain reauthorization was
removed by https://codereview.chromium.org/183713003 we no longer
need most of it.

BUG=411926

Review URL: https://codereview.chromium.org/558233002

Cr-Commit-Position: refs/heads/master@{#294187}