GitLab

This CL is a refactor with no intended behavior change. This is in
preparation for adding future methods to KeystoreService that return the
same type.

Bug: 1127505
Change-Id: Ia96d37301533cde335a38771d067c6054c164535
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485347Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819478}