Roll PDFium 3acb1ef..24c1eec

      https://pdfium.googlesource.com/pdfium.git/+log/3acb1ef..24c1eec

BUG=457480,497355
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1397173005

Cr-Commit-Position: refs/heads/master@{#353919}