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Chrome OS Account Manager's clients relied on |AccountTrackerService| to
map |AccountManager::AccountKey| to other representations (namely raw
email and canonical email). Due to the relation between one such client,
|ChromeOSOAuth2TokenServiceDelegate|, and |AccountTrackerService|, it
was required that |AccountTrackerService| should be able to store
account mappings for which a refresh token was not yet known. This
usage model is no longer supported. See the attached bug for context.

Fix this by adding a |raw_email| field in Chrome OS Account Manager's
Account proto definition. Future patches will change clients to read
this value.

Bug: 925827
Test: chromeos_unittests --gtest_filter="*AccountManager*Test*"
Test: unit_tests --gtest_filter="*CrOSOAuthDelegateTest*"
Test: browser_tests --gtest_filter="*Arc*AuthService*Test*"
Change-Id: I76ef741ec0a9ea38ae8757ff234c8be6dd7a3155
Reviewed-on: https://chromium-review.googlesource.com/c/1452003Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635493}