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This CL simplifies the code in pdfium_page_unittest.cc by refactoring
similar implementations of comparing PDF text runs into a new method.

Bug: 1008775
Change-Id: Ia6eedf03d3fb01118c919ae2f464bec0de842824
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946190
Commit-Queue: Kalpak Tapas <katapas@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721855}