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cryptohome::RetrievedKeyData and cryptohome::KeyDefinition both represent
subsets of the Key protobuf. This CL merges the two classes and makes the
resulting cryptohome::KeyDefinition contain all of Key's fields.

TBR=pamg (manager_password_service.cc)

BUG=367847
TEST=Updated unit tests

Review URL: https://codereview.chromium.org/526353002

Cr-Commit-Position: refs/heads/master@{#294823}