Roll PDFium from 5b4eaf71f78b to 837fe726e639 (2 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/5b4eaf71f78b..837fe726e639

2020-09-16 tsepez@chromium.org Rewrite some loops in CFXA_FMParser.
2020-09-16 tsepez@chromium.org Introduce PDFFuzzerPublic::MaybeForceGCAndPump().

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: I84f795181500294a4422d543a8095168830d9b99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415732Reviewed-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@{#807820}

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': '5b4eaf71f78bdb2e1c8b88a84eba68510dd871ac',
+  'pdfium_revision': '837fe726e639f823a62ed4aa4abda45d40f3c803',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.