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This reverts commit 5640f6c5.

Reason for revert: breaks PIN entry in some cases (crbug.com/1129713)

Original change's description:
> device/fido: add a cache for authenticator ECDH keys.
>
> While, at the moment, I don't believe we will end up asking for the
> authenticator's ECDH key twice, when we support the PRF extension we
> could. Thus add a cache and skip asking an authenticator for it twice.
>
> Change-Id: I73ecaa38447cbbe04f34c12d83f9c79bca553c90
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255208
> Commit-Queue: Adam Langley <agl@chromium.org>
> Auto-Submit: Adam Langley <agl@chromium.org>
> Reviewed-by: Martin Kreichgauer <martinkr@google.com>
> Cr-Commit-Position: refs/heads/master@{#781110}

Change-Id: Ief5dd139f1221b8bfbe58a6edf2390a022971538
Bug: 1129713
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418852Reviewed-by: Adam Langley <agl@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#808430}