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This reverts commit aab57914.

Reason for revert: Depends on crrev.com/c/1025898 which was reverted

Original change's description:
> Sync: Use IdentityManager instead of SigninManager
> 
> This CL migrates ProfileSyncService to IdentityManager for getting
> info on the primary account. This includes switching from
> SigninManagerBase::Observer to IdentityManager::Observer.
> The only remaining use of SigninManager within PSS it to call
> SignOut() which isn't exposed by IdentityManager yet.
> 
> Bug: 825190
> Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
> Change-Id: Icf9398d63794cab03cb559adba5c767e18c31c0a
> Reviewed-on: https://chromium-review.googlesource.com/983914
> Commit-Queue: Marc Treib <treib@chromium.org>
> Reviewed-by: Mikel Astiz <mastiz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#553973}

TBR=blundell@chromium.org,treib@chromium.org,mastiz@chromium.org

Change-Id: Ib40dbff0f1c8e5fba95cb9881681361abec5aeec
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 825190, 837201
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/1030372Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553997}