Roll PDFium from 9a3f345ba7c4 to f6437f54c9f0 (6 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/9a3f345ba7c4..f6437f54c9f0

2020-07-21 thestig@chromium.org Roll third_party/depot_tools/ 68978076f..9949ab7a4 (26 commits; 8 trivial rolls)
2020-07-21 dhoss@chromium.org Split path construction and painting in content generation
2020-07-20 tsepez@chromium.org Move CFX_XMLNode::EncodeEntities() to WideString.
2020-07-20 tsepez@chromium.org Fix nits in GCedTreeNode<>.
2020-07-20 tsepez@chromium.org Remove unreachable code in ~CFXA_Object().
2020-07-20 thestig@chromium.org Roll v8/ 65a118899..343030c9f (582 commits)

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: Ida2d752b4b988f34a2abf5291115c97f1a6a7b37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309656Reviewed-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@{#790296}

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': '9a3f345ba7c49cdc78e8caf4e667d94da8fcbbd9',
+  'pdfium_revision': 'f6437f54c9f0215f4241e81eba6a19e349b7fb4b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.