Drop GetRecoverableKeyStore reference

This using declaration was unfortunately missed when removing all the
other references to this message, which is preventing a system_api sync.

BUG=b:537422515

Change-Id: I722bbdd752e0857fe4184f776b15ff0af6fb3e33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8160653
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Auto-Submit: John Admanski <jadmanski@chromium.org>
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1670872}