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This moves the definition of the concrete keychain-access-group value
into AuthenticatorRequestClientDelegate, rather than hard-coding it in
the TouchIdAuthenticator. In the process, TouchIdAuthenticator creation
is moved out of //device/fido and into AuthenticatorImpl because of the
dependency on values from //content/browser.

For Chrome specifically, also update the keychain-access-group value to
match what we're setting it to in official builds since
crrev.com/c/1079833.

Bug: 837392, 848052
Change-Id: I97ef8972fed7ee29c597b9ab510d4a642b5a165a
Reviewed-on: https://chromium-review.googlesource.com/1083712
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567349}