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Make them available to other unit tests.

This time, add build dependencies for the "pdf_test_utils" source_set.

Change-Id: I75a1665c61e77032f218686f272e3788cb059474
Reviewed-on: https://chromium-review.googlesource.com/1246682Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594412}