Roll src/third_party/pdfium/ c5bfeec86..a827770fa (6 commits)

https://pdfium.googlesource.com/pdfium.git/+log/c5bfeec86aa7..a827770faf5c

$ git log c5bfeec86..a827770fa --date=short --no-merges --format='%ad %ae %s'
2017-12-04 dsinclair Shuffle XFA code around
2017-12-04 dsinclair XFA JS method cleanup
2017-12-04 dsinclair Remove XFA isolate tracker
2017-12-04 thestig Fix nits in CPDF_Type3Font.
2017-12-04 dsinclair Remove unused XFA code
2017-12-04 thestig Break out CFX_ImageTransformer mask calculations.

Created with:
  roll-dep src/third_party/pdfium


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: I7cabbea48671f114fa5da31107629a8062fe6590
Reviewed-on: https://chromium-review.googlesource.com/806422
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521385}

DEPS

@@ -98,7 +98,7 @@ 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': 'c5bfeec86aa70c2ec573c183bd3a8390a3d903e6',
+  'pdfium_revision': 'a827770faf5c3cfb157d59d401134e986dc4a18d',
   # 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.