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Add the WebAuthenticationCrosPlatformAuthenticator feature flag (default
disabled). If enabled, it will cause the FidoChromeOSDiscovery to be
instantiated for MakeCredential and GetAssertion requests that permit
the 'internal' transport.

Also move ChromeOS code up into the device namespace like most of the
other fido-related code. Its naming is sufficiently unique.

Bug: b/144861739
Change-Id: I50bf39c5c7841a7358840968d10a568c6f22ae6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088535
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749331}