Roll src/third_party/pdfium 636832d9a666..814821a14375 (6 commits)

https://pdfium.googlesource.com/pdfium.git/+log/636832d9a666..814821a14375

git log 636832d9a666..814821a14375 --date=short --no-merges --format='%ad %ae %s'
2019-11-08 tsepez@chromium.org Remove unused CBC_QRCoder::GetNumECBytes().
2019-11-08 tsepez@chromium.org Remove CBC_Writer::Set{Background,Barcode}Color().
2019-11-08 tsepez@chromium.org Cover more branches in fx_crypt_sha.cpp.
2019-11-08 tsepez@chromium.org Simplify control flow in FPDF_RenderPage().
2019-11-08 tsepez@chromium.org Remove duplicate FPDF_OBJECT_ definitions from fpdf_annot.h
2019-11-07 tsepez@chromium.org No need to check for null pages in RenderPageWithContext()

Created with:
  gclient setdep -r src/third_party/pdfium@814821a14375

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

TBR=pdfium-deps-rolls@chromium.org

Bug: None
Change-Id: Ic3a103b1f3483effe684a5eaaf730fdc4d69f372
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907196Reviewed-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@{#713983}

DEPS

@@ -192,7 +192,7 @@ 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': '636832d9a6668392ecea50fd43fcd06c4a3a2b79',
+  'pdfium_revision': '814821a14375e32ded4145335de0eee282f7e745',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.