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This updates browsing data deletion for DATA_TYPE_PASSWORDS to call
device::fido::mac::DeleteWebAuthnCredentials, which deletes credentials
created by the macOS platform authenticator from the OS keychain.

Also combine the two Touch ID specific configuration methods in
{Chrome,}AuthenticatorRequestDelegate and introduce a static variant for
Chrome.

Bug: 678128
Change-Id: I0034e0815da068fb27c1ea60cad95f958956838e
Reviewed-on: https://chromium-review.googlesource.com/1125177
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574697}