Remove _FXFA_USEGASFONTMGR_ (always true).
Remove _FXFA_USEGASFONTMGR_ (always true).

Small tidying.

R=ochang@chromium.org

Review URL: https://codereview.chromium.org/1601023004 .

DrAlexx/pdfium,andoma/pdfium,DrAlexx/pdfium,andoma/pdfium,andoma/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,andoma/pdfium