Roll src/third_party/pdfium a40862f237fc..8ecb862ae74d (5 commits)

https://pdfium.googlesource.com/pdfium.git/+log/a40862f237fc..8ecb862ae74d

git log a40862f237fc..8ecb862ae74d --date=short --first-parent --format='%ad %ae %s'
2020-03-05 tsepez@chromium.org Retain layout item in all CFXA_FF.*::Paste() method overrides.
2020-03-05 nigi@chromium.org Add FXSYS_IsLowerASCII().
2020-03-05 nigi@chromium.org Add a caller for FXSYS_ToUpperASCII() to simplify code.
2020-03-04 tsepez@chromium.org Retain layout item in a few more places where text changes.
2020-03-04 nigi@chromium.org Add FXSYS_IsUpperASCII().

Created with:
  gclient setdep -r src/third_party/pdfium@8ecb862ae74d

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:1055869,chromium:1058653
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I221c2f725aa0dce901bf6c3c8f2fd91c0aea28a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090223Reviewed-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@{#747461}

DEPS

@@ -195,7 +195,7 @@ 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': 'a40862f237fc1d14779e6f6924e954ebcc8d18a3',
+  'pdfium_revision': '8ecb862ae74dda3e98cfe7e027d0b7800514ee0f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.