Roll src/third_party/pdfium 74dbc8af75f9..9fa72471b87d (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/74dbc8af75f9..9fa72471b87d

git log 74dbc8af75f9..9fa72471b87d --date=short --no-merges --format='%ad %ae %s'
2019-10-10 thestig@chromium.org Add some unit tests for fx_date_helpers.h.
2019-10-10 awscreen@chromium.org [lcms] Clusterfuzz - avoid secondary integer overflow

Created with:
  gclient setdep -r src/third_party/pdfium@9fa72471b87d

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

TBR=pdfium-deps-rolls@chromium.org

Bug: chromium:1009235
Change-Id: I08347b6354cfd7d4ac31e5aa568ed46727b5f2d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1853288Reviewed-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@{#704772}

DEPS

@@ -187,7 +187,7 @@ 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': '74dbc8af75f9dc2490e498f3de57c84edb2fb4fe',
+  'pdfium_revision': '9fa72471b87de2f4db6d13097519e6cc854e7620',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.