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Similar to IsWinNativeApiAuthenticator() and IsTouchIdAuthenticator(),
add IsChromeOSAuthenticator() which is only compiled on ChromeOS.

Bug: crbug:1115811, b:144861739
Change-Id: I80b88392e1c9edf501709ced7709db889370774b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357954
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#798346}