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Original change: https://crrev.com/c/1015850

Chromium and Google Chrome show different messages when the PDF plugin
is missing in Print Preview. Modify the test to accept either message,
to fix official build failures.

Bug: 814860
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I1672512db0c50bbf2e95ae6c9798dca82e4ee71c
Reviewed-on: https://chromium-review.googlesource.com/1028566Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553820}