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This wraps the existing CountWebAuthnCredentials and
DeleteWebAuthnCredentials functions in a new interface called
PlatformCredentialStore. The Touch ID implementation of the interface
encapsulates the |metadata_secret| and |keychain_access_group|
parameters that currently have to be fetched from the Profile and passed
explicitly. This will allow us to not leak this implementation detail
into the browsing data deletion code.

This also moves the existing TouchIdAuthenticatorConfig struct from
//content into //device/fido/mac, so that it can be passed as the ctor
argument to the credential store.

This is only a structural change. No functional changes intended.

Change-Id: I4eda36d82c80fa13a91f5ce5e508f4a23803574f
Reviewed-on: https://chromium-review.googlesource.com/1242400Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#595931}