Roll src/third_party/pdfium 0844b9a3b625..1c5647025500 (4 commits)

https://pdfium.googlesource.com/pdfium.git/+log/0844b9a3b625..1c5647025500

git log 0844b9a3b625..1c5647025500 --date=short --first-parent --format='%ad %ae %s'
2020-02-12 tsepez@chromium.org Small cleanup to CFX_CSSSyntaxParser.
2020-02-12 thestig@chromium.org Use size_t in CFX_CSSStyleSheet.
2020-02-12 thestig@chromium.org Roll third_party/freetype/src/ 4a19a53d5..8930cc961 (1 commit)
2020-02-12 tsepez@chromium.org Test uncovered comment handling paths in CSS parser.

Created with:
  gclient setdep -r src/third_party/pdfium@1c5647025500

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: I98e3f3145246f63ce283c5b7f43bb825d149a8d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2052765Reviewed-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@{#740889}

DEPS

@@ -191,7 +191,7 @@ 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': '0844b9a3b6259ff2af9e77425aa4bd3dcf71d861',
+  'pdfium_revision': '1c5647025500b429c1dc5e5175b019d07ea38407',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.