Roll PDFium from bb85de36d277 to fbf13333b426 (7 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/bb85de36d277..fbf13333b426

2020-08-22 tsepez@chromium.org Remove core/fxge/fx_ge_fontmap.cpp
2020-08-22 thestig@chromium.org Switch from check_targets to no_check_targets.
2020-08-22 thestig@chromium.org Sync gtest/gmock with Chromium's copy.
2020-08-21 tsepez@chromium.org Remove virtual method SystemFontInfoIface::GetFaceIndex().
2020-08-21 tsepez@chromium.org Nest CFWL_EventTarget inside CFWL_NoteDriver.
2020-08-21 tsepez@chromium.org Make CXFA_FFApp::m_pFontMgr be a pointer
2020-08-21 tsepez@chromium.org Mark CFWL_Event and its subclasses stack-only types.

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: I0aa1c7e9e79e1aaf1dc317fca1d0c75354aa18bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369716Reviewed-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@{#800809}

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': 'bb85de36d277a449690e167f63a4ee988877f78d',
+  'pdfium_revision': 'fbf13333b42604fa0c3093f4d5ce44a50bbb8418',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.