Roll src/third_party/pdfium d41929adaddf..451ed2dbac83 (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/d41929adaddf..451ed2dbac83

git log d41929adaddf..451ed2dbac83 --date=short --no-merges --format='%ad %ae %s'
2019-08-19 tsepez@chromium.org Move some CPDFXFA_Widget specific methods out of CPDFSDK_Annot
2019-08-19 thestig@chromium.org Remove an impossible condition in CPDF_CMapParser::ParseWord().

Created with:
  gclient setdep -r src/third_party/pdfium@451ed2dbac83

The AutoRoll server is located here: https://autoroll.skia.org/r/pdfium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TBR=pdfium-deps-rolls@chromium.org

Bug: None
Change-Id: Ie1501e09262376ef751550c598a9cc88594c2c4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761495Reviewed-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@{#688363}

DEPS

@@ -165,7 +165,7 @@ 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': 'd41929adaddfae9547d4d8e1993345906d2ff272',
+  'pdfium_revision': '451ed2dbac83f787ca6438a4efe347e0ff986bf4',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.