Roll src/third_party/pdfium 5fcd7aab39b8..9231ac5e1c68 (6 commits)

https://pdfium.googlesource.com/pdfium.git/+log/5fcd7aab39b8..9231ac5e1c68


git log 5fcd7aab39b8..9231ac5e1c68 --date=short --no-merges --format='%ad %ae %s'
2019-07-10 nigi@chromium.org Fix issue with missing thin diagonal lines.
2019-07-10 thestig@chromium.org Roll build/ 5a8b627ed..f52a9d0c5 (268 commits)
2019-07-10 tsepez@chromium.org Pass CPDF_Font itself to CFGAS_GEFont::LoadFont()
2019-07-10 nigi@chromium.org Fix undo and redo actions for replacing string.
2019-07-10 thestig@chromium.org Make IXFA_DocEnvironment::PopupMenu() pass a CFX_PointF by const-ref.
2019-07-10 tsepez@chromium.org Observe CXFA_FFWidgets in CPDFSDK_XFAWidget.


Created with:
  gclient setdep -r src/third_party/pdfium@9231ac5e1c68

The AutoRoll server is located here: https://autoroll.skia.org/r/pdfium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.



BUG=chromium:982828
TBR=pdfium-deps-rolls@chromium.org

Change-Id: Ia7a1f47c5e31820d6d16e44e5dca6aeffb8bae77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695830Reviewed-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@{#676206}

DEPS

@@ -162,7 +162,7 @@ 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': '5fcd7aab39b8afacd2260b4f0448a6ef7efe02fd',
+  'pdfium_revision': '9231ac5e1c6884555571fa2541fcbc10ff97a180',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.