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This CL is one part of the effort to change chrome to use gaiaid instead of
email address as the unique id for an account.

BUG=341408

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291263

Review URL: https://codereview.chromium.org/425823002

Cr-Commit-Position: refs/heads/master@{#291686}