Fix typo from commit d3611f.
Fix typo from commit d3611f.

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1242493003 .

bradh/pdfium,klokantech/pdfium,rouault/pdfium,andoma/pdfium,azunite/libpdfium,chenjian-rits/HelloWorld,azunite/libpdfium,was4444/pdfium,klokantech/pdfium,chenjian-rits/HelloWorld,rouault/pdfium,azunite/libpdfium,bradh/pdfium,andoma/pdfium,bradh/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,chenjian-rits/HelloWorld,DrAlexx/pdfium,klokantech/pdfium,azunite/libpdfium,was4444/pdfium,was4444/pdfium,rouault/pdfium,andoma/pdfium,DrAlexx/pdfium,andoma/pdfium,was4444/pdfium