Roll src/third_party/pdfium 94e600d98301..44d038359f4e (6 commits)

https://pdfium.googlesource.com/pdfium.git/+log/94e600d98301..44d038359f4e

git log 94e600d98301..44d038359f4e --date=short --no-merges --format='%ad %ae %s'
2019-10-18 thestig@chromium.org Rename FXFONT_BOLD flag to FXFONT_FORCE_BOLD.
2019-10-18 thestig@chromium.org Do more CPDF_StreamContentParser initialization in the header.
2019-10-18 thestig@chromium.org Replace |CPDF_StreamContentParser::m_DefFontSize| with a constant.
2019-10-18 thestig@chromium.org Do more testing in ByteString.OneCharReverseIterator unit test.
2019-10-18 thestig@chromium.org Rename some Empty() methods to Clear().
2019-10-18 thestig@chromium.org Add a test case for incorrectly rendered Japanese PDFs.

Created with:
  gclient setdep -r src/third_party/pdfium@44d038359f4e

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: None
Change-Id: Ia5308fd66b19b7111c351603a932919e3143725b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869442Reviewed-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@{#707513}

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': '94e600d98301661502135a89db1fb0cc7caae5e9',
+  'pdfium_revision': '44d038359f4ee991e42da983a15c012c2b13b638',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.