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Chrome OS Account Manager's observers need to map
|AccountManager::AccountKey| to email ids. This mapping was being
provided by |AccountMapperUtil|, but we want to eliminate that class and
maintain the mapping directly in AccountManager.

https://crrev.com/c/1452003 ensured that all new account additions in
Chrome OS Account Manager have an email id associated with them. This
patch makes the email id available for reading in observer
notifications and |AccountManager::GetAccounts|.

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: I0e130ce968a02a37f2380460f6936b5cf169ae02
Reviewed-on: https://chromium-review.googlesource.com/c/1477691Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635908}