Now that we only have the seeded variant, let's call it
number_dictionary_map. It's cleaner.

R=mstarzinger@chromium.org

Change-Id: I3e36ecb15140b5def835ca8ebe50ab829a21892d
Reviewed-on: https://chromium-review.googlesource.com/756749Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49183}