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Now that the binary size is less significantly impacted by introducing
additional ProtoDatabase instances (crrev.com/c/1419199), switch to
using a unique ProtoDatabase for each proto message type.

Bug: 921133
Change-Id: Ieae1fc5ba98c574c8e4f9a2587bffa4333fa80df
Reviewed-on: https://chromium-review.googlesource.com/c/1471266
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Patrick Noland <pnoland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631968}