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There is no need to keep this function since printing/units.h has such
conversion already.

R=thestig

Bug: None
Change-Id: Ib6164b40d5f8a6b812b7ebc2f81942403eb3926a
Reviewed-on: https://chromium-review.googlesource.com/1255604Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595591}