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Currently, ChromeOS defines the OS_LINUX directive as well as
OS_CHROMEOS.  We're working to separate these two, so we're
making the fact that OS_LINUX == OS_LINUX || OS_CHROMEOS
explicit.

This is changes for /content

This CL was uploaded by git cl split.

R=jam@chromium.org

Bug: 1110266
Change-Id: I0c8a97e7a0014daab6528182f81072d71f0ee737
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370296Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801194}