Roll src/third_party/pdfium/ a85e5ca5f..1bc5e494b (4 commits)

https://pdfium.googlesource.com/pdfium.git/+log/a85e5ca5f2df..1bc5e494b675

$ git log a85e5ca5f..1bc5e494b --date=short --no-merges --format='%ad %ae %s'
2017-11-01 dsinclair Add CJX_ThisProxy
2017-11-01 dsinclair Convert CScript classes to have CJX objects
2017-11-01 dsinclair Move CXFA_NodeList JS to CJX_NodeList
2017-11-01 dsinclair Move the item methods into CXFA_Node propertly

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: Ib34123349d969d44fb5c85514df5d1ed12bb5a1c
Reviewed-on: https://chromium-review.googlesource.com/748711
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513248}

DEPS

@@ -83,7 +83,7 @@ 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': 'a85e5ca5f2dfadcf9f3812a8ef039d1f206833a4',
+  'pdfium_revision': '1bc5e494b675aeb5e73cae1d0d3cfad341a05a60',
   # 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.