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Build a binary for the PDFium fuzzer added in
https://pdfium-review.googlesource.com/61470 .

Change-Id: Ibec0fb7289691e446d62af5557385aef1253d30c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873397Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708686}