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We couldn't do this when increment_install was not a GN arg, but it's
easy to do now that it is :).

Bug: None
Change-Id: I42c243fa530e448158405bf4157016f578f319ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573011
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833817}