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This reverts commit 203117d9.

Reason for revert: broke downstream and official builders. Builder:
http://uberchromegw/i/official.android/builders/official-arm/builds/3216

Original change's description:
> Rename U2f* to Fido2*
> 
> In GmsCore v19, the Fido2 APIs will provide the unified functionality
> of the U2F and Fido2 APIs so it will no longer be necessary to call
> both of them.
> 
> Since the rename spans upstream and downstream, will initially add
> all Fido2* classes and then later remove the U2f* classes once
> downstream changes have landed.
> 
> Bug: 842006
> Change-Id: I4775682b428c0ffdc4aa6f699136a2c7d15ee40c
> Reviewed-on: https://chromium-review.googlesource.com/1054778
> Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
> Commit-Queue: Kim Paulhamus <kpaulhamus@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#558479}

TBR=mariakhomenko@chromium.org,kpaulhamus@chromium.org

Change-Id: I20e10d48e1630d8a084003287f2dda9365d030be
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 843011, 842006
Reviewed-on: https://chromium-review.googlesource.com/1059595Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558680}