Given https://bugs.chromium.org/p/chromium/issues/detail?id=908840#c3, we can convert AccountTrackerService::GetAccounts() to IdentityManager::GetAccountsWithValidRefreshTokens().

The exceptions are 1. internal uses in components/signin, 2. use from PO2TS delegate implementations.

In #2, I meant IdentityManager::GetAccountsWithRefreshTokens().

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/da0c201140f264cad2706c2435c692cf9cb39e51

commit da0c201140f264cad2706c2435c692cf9cb39e51
Author: Sylvain Defresne <sdefresne@chromium.org>
Date: Thu Nov 29 17:04:30 2018

Convert SignedInAccountsViewController to IdentityManager

Uses IdentityManager API instead of using the soon to be
private ProfileOAuth2TokenService and AccountTrackerService
APIs.

Bug: 908855
Change-Id: If533b43a698b2f2ea7c24ad43273b4ecba74091f
Reviewed-on: https://chromium-review.googlesource.com/c/1354447
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612236}
[modify] https://crrev.com/da0c201140f264cad2706c2435c692cf9cb39e51/ios/chrome/browser/ui/authentication/BUILD.gn
[modify] https://crrev.com/da0c201140f264cad2706c2435c692cf9cb39e51/ios/chrome/browser/ui/authentication/signed_in_accounts_view_controller.mm
[modify] https://crrev.com/da0c201140f264cad2706c2435c692cf9cb39e51/services/identity/public/objc/identity_manager_observer_bridge.h
[modify] https://crrev.com/da0c201140f264cad2706c2435c692cf9cb39e51/services/identity/public/objc/identity_manager_observer_bridge.mm

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