Roll src/third_party/pdfium 8a0f76d3749e..3d7ad5ed37c1 (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/8a0f76d3749e..3d7ad5ed37c1

git log 8a0f76d3749e..3d7ad5ed37c1 --date=short --first-parent --format='%ad %ae %s'
2019-12-03 thestig@chromium.org Roll third_party/freetype/src/ 3aaae716b..551bd3a90 (10 commits)
2019-12-03 tsepez@chromium.org Handle codepoints outside BMP in CFXJSE_FormCalcContext::Encode().

Created with:
  gclient setdep -r src/third_party/pdfium@3d7ad5ed37c1

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: chromium:1029565
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I153d55e7f0fbe843537e21f2e824f6eeb37343ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949584Reviewed-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@{#721275}

DEPS

@@ -192,7 +192,7 @@ 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': '8a0f76d3749e7636ddf02c89584eb3e3a032564c',
+  'pdfium_revision': '3d7ad5ed37c10877b3f4cff01d4cfe61e95ffa40',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.