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It's currently using base::WriteInto from string_util.h which it gets
transitively from components/leveldb_proto/proto_database_impl.h.

Change-Id: Ic795ad30ef79b9abf34ab028da202d92123ca249
Reviewed-on: https://chromium-review.googlesource.com/1185365Reviewed-by: Filip Gorski <fgorski@chromium.org>
Commit-Queue: Troy Hildebrandt <thildebr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585250}