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The Document Scan API is only supported on Chrome OS, so ensure it is
only built on Chrome OS. Additionally, remove the unnecessary
DocumentScanInterface layer now that there doesn't have to be interface
implementations for Chrome OS and non-Chrome OS builds.

Bug: None
Test: Perform a scan using the Scan extension
Change-Id: Ie18d15cac752e9166be6ee538cae3a7e3c8fe4bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296642
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788820}