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This is just a minor build rule simplification. Should not affect
anything.

Change-Id: If778e8c2ece6e223b492ed4f172ce138f3c4e357
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845932
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703482}