Roll src/third_party/pdfium e83d8b4f0dd4..f793e3abc4ec (11 commits)

https://pdfium.googlesource.com/pdfium.git/+log/e83d8b4f0dd4..f793e3abc4ec

git log e83d8b4f0dd4..f793e3abc4ec --date=short --first-parent --format='%ad %ae %s'
2020-01-09 tsepez@chromium.org Remove FWL_STYLEEXT_DTP_LongDateFormat.
2020-01-09 tsepez@chromium.org CFWL_WidgetTP::Initialize() and Finalize() are unused.
2020-01-09 tsepez@chromium.org Remove CFX_Break::SetDefaultChar()
2020-01-09 tsepez@chromium.org Warn about stale |this| in CXFA_FFWidget::On*() methods
2020-01-09 nigi@chromium.org Change StringToCode() to return Optional<uint32_t> type.
2020-01-09 tsepez@chromium.org Rename CXFA_FFWidget::OnHitTest() to HitTest()
2020-01-08 dhoss@chromium.org Use std::unique_ptr inside FPDFDOC_ExitFormFillEnvironment()
2020-01-08 tsepez@chromium.org Clean up stale pointer in CXFA_ViewLayoutProcessor::MergePageSetContents()
2020-01-08 tsepez@chromium.org Give better names to CXFA_ViewLayoutProcessor members
2020-01-08 tsepez@chromium.org Comment move behavior for fxcrt string and pointer types.
2020-01-08 tsepez@chromium.org Move CXFA_Node property manipulation out from CJX_Object.

Created with:
  gclient setdep -r src/third_party/pdfium@f793e3abc4ec

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:1038489,chromium:1039257
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I4491d9de0bb7b921ade17c3e589d1679e9337102
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992863Reviewed-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@{#729631}

DEPS

@@ -201,7 +201,7 @@ 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': 'e83d8b4f0dd4b0c4edc3ea0d24d5fc0fcce40ed4',
+  'pdfium_revision': 'f793e3abc4ecaea52b9f1e960df3505233e466d6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.