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This CL moves PO2TSIOSDelegate to
//components/signin/internal/identity_manager and DeviceAccountsProvider
to //components/signin/public/identity_manager/ios.

Additionally, profile_oauth2_token_service_ios_delegate* is renamed to
profile_oauth2_token_service_delegate_ios*.

This CL is required for moving the building of IdentityManager in //ios
into identity_manager_builder.cc and
profile_oauth2_token_service_builder.cc.

TBR=jochen@chromium.org

Bug: 952788
Change-Id: I18ed100802f436699e9928fbcf0068b97b4c406a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1701851Reviewed-by: Henrique Ferreiro <hferreiro@igalia.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#678596}