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There's no need to keep this code under sync/base after the last
refactorings, so we can shrink base libraries, which many build targets
depend on.

Bug: 922971
Change-Id: Ib033a694c9bdd732a3e4346fb63121f540235e60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1564129Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Jeffrey Cohen <jeffreycohen@chromium.org>
Reviewed-by: Satoru Takabayashi <satorux@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658980}