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This moves the initial account seeding and reload from
oauth2_token_service_delegate_android.*'s construction to
SigninManager.java's. This also removes direct calls to
OAuth2TokenService.java updateAccountList, using IdentityMutator
instead.

Bug: 934688
Change-Id: I02dd5932740f23cce2187ea367ca65282f91cf4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1751188
Commit-Queue: Pâris Meuleman <pmeuleman@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Auto-Submit: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709547}