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The method does not interact with any PrintedDocument member variables.
Simplify its unit test and avoid instantiating a dummy PrintedDocument.

Change-Id: I8478a88a4044c5fce8799f203e483b874bac5c26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145781Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758276}