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Such directives violate the style guide.  Instead pull in just the actual
vector commands, via individual using declarations, via a macro.

Bug: 82078
Change-Id: I0f3208916285d6e2788932302714e394f1d92d87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810618
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698693}