Fix fix fix of mac build breakage at 9cf44c2e
Fix fix fix of mac build breakage at 9cf44c2e

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1296403002 .

was4444/pdfium,andoma/pdfium,andoma/pdfium,andoma/pdfium,azunite/libpdfium,DrAlexx/pdfium,azunite/libpdfium,azunite/libpdfium,andoma/pdfium,azunite/libpdfium,was4444/pdfium,DrAlexx/pdfium,was4444/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,was4444/pdfium