Roll src/third_party/pdfium 8133374cb7fe..4935770daa8e (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/8133374cb7fe..4935770daa8e

git log 8133374cb7fe..4935770daa8e --date=short --no-merges --format='%ad %ae %s'
2019-08-19 tsepez@chromium.org Initialize widget handlers from topmost fpdfsdk.
2019-08-19 tsepez@chromium.org Avoid casting to CPDFXFA_Context just to get form type.

Created with:
  gclient setdep -r src/third_party/pdfium@4935770daa8e

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: I8bd5c37c009f066f76e1d50c714f56964372c6c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761000Reviewed-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@{#688197}

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': '8133374cb7fee20ce5b765269fa11e4c35332251',
+  'pdfium_revision': '4935770daa8e301c12f4e5d021b6124fc96dc28c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.