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This allows proper unittests for this code and simplifies further
caching of results.

BUG=chromium:902600

Change-Id: Ife150c93225e54f6defab814ad5d9c12c8508106
Reviewed-on: https://chromium-review.googlesource.com/c/1327941
Commit-Queue: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606747}