Roll PDFium from 46d39660e0e6 to 5f4456e3c52f (5 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/46d39660e0e6..5f4456e3c52f

2020-08-14 tsepez@chromium.org Pass CFWL_Widget properties by const-ref.
2020-08-14 tsepez@chromium.org Move CFWL_WidgetProperties::m_WidgetRect to CFWL_Widget.
2020-08-14 tsepez@chromium.org Remove CFWL_WidgetMgr::Item::iRedrawCounter.
2020-08-14 tsepez@chromium.org Misc tidy in CFWL_WidgetMgr.
2020-08-14 tsepez@chromium.org Avoid null CFWL_Message checks in OnProcessMessage.

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: I91e689e04157b4642d4bcebc98be4662232c954b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2358612Reviewed-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@{#798419}

DEPS

@@ -215,7 +215,7 @@ 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': '46d39660e0e6c8f54d2677a0054530fcbba25c07',
+  'pdfium_revision': '5f4456e3c52fbe17db79da16b1122f21dbcd3582',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.