Roll src/third_party/pdfium 4c0fac2e6b05..416bf2e2bf82 (4 commits)

https://pdfium.googlesource.com/pdfium.git/+log/4c0fac2e6b05..416bf2e2bf82

git log 4c0fac2e6b05..416bf2e2bf82 --date=short --first-parent --format='%ad %ae %s'
2020-04-18 tsepez@chromium.org Move char/wchar_t vectors to data partition.
2020-04-18 thestig@chromium.org Add third_party/base/immediate_crash.h.
2020-04-17 thestig@chromium.org Use spans in CPDF_TextRenderer.
2020-04-17 thestig@chromium.org Use Chromium-style names in GetCharPosList().

Created with:
  gclient setdep -r src/third_party/pdfium@416bf2e2bf82

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: I7c0bd27e31bcf94aa2ea77ed93fab0221234852a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155290Reviewed-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@{#760288}

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': '4c0fac2e6b05f8a4008584fd38f22ab1eae364f9',
+  'pdfium_revision': '416bf2e2bf823159c738ae1fb15adddd492ddc38',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.