Migrate ChromeBrowserStateManagerImpl to the IdentityManager

Move away from SigninManagerBase::GetAuthenticatedAccountId() and
AccountTrackerService::GetAccountInfo(), to rely on the IdentityManager.

Bug: 903835
Change-Id: Ia9b3f6251ad93b9cd6e042b54283b56fb0610bc8
Reviewed-on: https://chromium-review.googlesource.com/c/1333447
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#607614}
2 files changed