Roll src/third_party/pdfium/ 36bbc24e2..19a33e4ec (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/36bbc24e2d7e..19a33e4ece99

$ git log 36bbc24e2..19a33e4ec --date=short --no-merges --format='%ad %ae %s'
2018-03-21 hnakashima Rewrite CPDFXFA_DocEnvironment::GetPopupPos.
2018-03-21 thestig Add functions to convert various FPDF_ types.

Created with:
  roll-dep src/third_party/pdfium
BUG=chromium:820106


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

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=dsinclair@chromium.org

Change-Id: Icbc4e87948a22899f2b3ae2102629eb5f9402f34
Reviewed-on: https://chromium-review.googlesource.com/974103Reviewed-by: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#544875}

DEPS

@@ -103,7 +103,7 @@ 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': '36bbc24e2d7e5082047ad5b783c69518accafe42',
+  'pdfium_revision': '19a33e4ece99c4bb438d870c52fbc5ed5e80c897',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.