Roll src/third_party/pdfium 2def28bf1003..32d4291f7a61 (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/2def28bf1003..32d4291f7a61

git log 2def28bf1003..32d4291f7a61 --date=short --first-parent --format='%ad %ae %s'
2020-01-28 thestig@chromium.org Change CFX_DIBBase::GetPaletteSize() to return size_t.
2020-01-27 tsepez@chromium.org Fix segv in CXFA_LayoutPageMgr::ProcessLastPageSet().

Created with:
  gclient setdep -r src/third_party/pdfium@32d4291f7a61

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: None
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I55d8fb2a6017e3efd30711d8e326d4e23696e120
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024308Reviewed-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@{#735714}

DEPS

@@ -197,7 +197,7 @@ 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': '2def28bf1003a584f688840a595729d76ea6d393',
+  'pdfium_revision': '32d4291f7a61f30f36863f1caff1a60965060679',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.