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Using global defines pollutes the build. The preferred method for
feature defines are to use buildflags, which are scoped to the targets
and files that require them.

Change-Id: Id9d749cbbb4f9a1a6847171df1cbc1c903bacdbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803804Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703920}