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Replaces instances of "CHROME_OS" with "OS_CHROMEOS" in macros in
FastInitiationManager.

Original umbrella issue: crbug.com/1099858

Bug: 1119969
Change-Id: Ia0c1334f607cfd583a4c8c327dab196fd73ba808
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369736Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801072}