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This reverts commit 198eca95.

Reason for revert: breaking GPU Linux Builder

Original change's description:
> Migrate consumers of SigninManager::IsAllowedUsername()
> 
> Use identity::IsUsernameAllowedByPattern() instead so that we can migrate
> those consumers entirely to the IdentityManager in follow-up patches.
> 
> Also, in order to make it explicit that this API should not be used any
> more, make SigninManager::IsAllowedUsername() a private method and friend
> it with the relevant test cases from SigninManagerTest, so that it can
> only be used from there. And while at it, also remove some stale lines
> "friending" SigninManager with test cases that no longer exist.
> 
> Bug: 890794, 890815, 906085
> Change-Id: Id8a72b0efd89818e02c6d1e73aac1451207b9625
> Reviewed-on: https://chromium-review.googlesource.com/c/1346409
> Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#611704}

TBR=blundell@chromium.org,msarda@chromium.org,sdefresne@chromium.org,mario@igalia.com

Change-Id: I8172674e32d7671868fa5374a9457abd6413321e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 890794, 890815, 906085
Reviewed-on: https://chromium-review.googlesource.com/c/1354121Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#611710}