Roll PDFium from 494efc70ded6 to 8e0ff2457021 (2 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/494efc70ded6..8e0ff2457021

2020-12-01 tsepez@chromium.org Remove most remaining CFXJSE_Value from CFXJSE_FormCalcContext.
2020-12-01 tsepez@chromium.org Rework XFA_ResolveNodeRS.

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/+doc/master/autoroll/README.md

Bug: None
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I1d588370983459cd4d345965a43d763608348e3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567748Reviewed-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@{#832579}

DEPS

@@ -220,7 +220,7 @@ 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': '494efc70ded6db2688e70d3cd0e1c072b0fd2f21',
+  'pdfium_revision': '8e0ff24570216913e3581fa4563bdae5960b1075',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.