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CHROMEOS macro is defined in third_party/webrtc.
This CL replaces it with more appropriate macro.

Bug: None
Change-Id: Ia62a2a1e4b129f7aef7aadb2e7d8158ff06b22f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022045Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735660}