Roll src/third_party/pdfium cd628918e732..3ea38438da69 (9 commits)

https://pdfium.googlesource.com/pdfium.git/+log/cd628918e732..3ea38438da69

git log cd628918e732..3ea38438da69 --date=short --first-parent --format='%ad %ae %s'
2020-05-09 thestig@chromium.org Use GetPlatformString() in more tests.
2020-05-09 thestig@chromium.org Fix FPDF_GetNamedDest() for old style destinations.
2020-05-09 thestig@chromium.org Add tests for FPDF_GetNamedDest() with old style destinations.
2020-05-09 thestig@chromium.org Make CPDF_NameTree::LookupNamedDest() work for old style destinations.
2020-05-09 thestig@chromium.org Give a variable in FPDF_CountNamedDests() a better name.
2020-05-09 thestig@chromium.org Make CPDF_NameTree::LookupNamedDest() a static method.
2020-05-09 thestig@chromium.org Add tests for FPDF_GetNamedDestByName() with old style destinations.
2020-05-09 thestig@chromium.org Move some code out of CPDF_NameTree::LookupNamedDest().
2020-05-09 thestig@chromium.org Change CPDF_NameTree::LookupNamedDest() to take a ByteString.

Created with:
  gclient setdep -r src/third_party/pdfium@3ea38438da69

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/+/master/autoroll/README.md

Bug: chromium:1080663
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I49db891c91ca88f0e6ff96f07e454d4f46ec0687
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2191225
Reviewed-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@{#767108}