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This CL modifies the logic for enabling GMC by default. This fixes an
issue where GMC was enabled by default on ChromeOS.

Bug: 995836
Change-Id: I6b38423043a9c50480dc255eb9a12dc2500cb714
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761779Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688694}