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Hasn't been used since we switched to per-library R.java generation.
Confirmed locally that all of my .build_config files had empty lists for
the value.

Bug: 1073476
Change-Id: I7b49ffda929591c7f3c8fdbe3dcffe30021bf00b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606516
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839761}