Roll src/third_party/pdfium 4745a47b272f..57b83355c515 (3 commits)

https://pdfium.googlesource.com/pdfium.git/+log/4745a47b272f..57b83355c515

git log 4745a47b272f..57b83355c515 --date=short --first-parent --format='%ad %ae %s'
2020-02-27 thestig@chromium.org Roll third_party/freetype/src/ 49f3394d7..141da0281 (4 commits)
2020-02-27 thestig@chromium.org Report multiple unsupported errors in ReportUnsupportedFeatures().
2020-02-27 dhoss@chromium.org Modernize CXFA_FMSimpleExpression derived classes

Created with:
  gclient setdep -r src/third_party/pdfium@57b83355c515

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/pdfium-autoroll
Please CC pdfium-deps-rolls@chromium.org on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: If164dabc34d0d839fbee2a4faa1c6e12cbbe9ee4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079853Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#745340}

DEPS

@@ -195,7 +195,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
-  'pdfium_revision': '4745a47b272fe1eeae0c5159cc479c541f744fc5',
+  'pdfium_revision': '57b83355c5155c2f8f9093b1e13ec12dd1bfe2f7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.