Refactor OS_LINUX preprocessor directive for LaCrOS effort.

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 /google_apis/gcm

This CL was uploaded by git cl split.

R=dimich@chromium.org

Bug: 1110266
Change-Id: I2403e075be078395a691fdf6ea1f04e33dc76fa1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370299
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Sean McAllister <smcallis@google.com>
Cr-Commit-Position: refs/heads/master@{#803144}
GitOrigin-RevId: 8b2e68dcda751f2b85c65e13f215ce74904cb115
1 file changed