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The Mac doesn't always support full desktop capture (e.g., it is
not support unless the DPIs of all displays match). This check
is not necessary on other platforms.

Change-Id: I444732f153b706bb1615b8c3cd1798b15cc66540
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096095
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Auto-Submit: Gary Kacmarcik <garykac@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748890}