Don't remove -Wheader-hygiene for pdfium, 41f0590a9d7 fixed all violations.

BUG=375558
1 file changed
tree: d8489c1667c17aeb872eaa92899013aa74af6b6b
  1. core/
  2. fpdfsdk/
  3. AUTHORS
  4. codereview.settings
  5. LICENSE
  6. pdfium.gyp