Roll PDFium from 337086da0b11 to 0517bfe506ad (2 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/337086da0b11..0517bfe506ad

2020-10-22 thestig@chromium.org Remove `FXDIB_Format::kRgba`.
2020-10-22 thestig@chromium.org Remove `FXDIB_Format::k8bppRgba`.

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: Ib77649cde5d1bae65679ce30f31a4ea1b59af433
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491347Reviewed-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@{#819751}

DEPS

@@ -226,7 +226,7 @@ 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': '337086da0b11e7a3c2cfac87aeeec70aa9e01e0c',
+  'pdfium_revision': '0517bfe506adccd4815c7927953089d81b03d353',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.