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Exposing last keystore key name allows the following:
1. Avoiding unnecessary copies of underlying CryptographerImpl in
NigoriState::NeedsKeystoreKeyRotation().
2. Removing ComputePbkdf2KeyName() from nigori_state.cc
3. Exposing HasKey(key_name) instead of HasKey(key_proto) from
CryptographerImpl.

This CL also adds unittests for KeystoreKeysCryptographer.

Bug: 922900
Change-Id: If7004c658adeae2bd03d77f08b39fa63dd278b6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868873
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#707799}