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This CL unifies those two buildflags file for Chrome OS.

BUG=1114198
TEST=Build locally. Ran tryjob.

Change-Id: Id7343da06ac6b17cb20cb20babdd8ab06ac40028
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377525
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804308}