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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 /weblayer

This CL was uploaded by git cl split.

R=nator@chromium.org

Bug: 1110266
Change-Id: I43b0a1f583fd61f28a52315b1a81445306a44f52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371305
Commit-Queue: Sean McAllister <smcallis@google.com>
Auto-Submit: Sean McAllister <smcallis@google.com>
Reviewed-by: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801058}