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That's what it means, and it avoids confusion with other
GetPreferredDataTypes methods.

Bug: none
Change-Id: If47b53cf474252f8b27d91fc582e527059179ed3
Reviewed-on: https://chromium-review.googlesource.com/c/1341837Reviewed-by: Florian Uunk <feuunk@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609304}