Roll src/third_party/pdfium a7e0cc8291d3..4efdb5120090 (7 commits)

https://pdfium.googlesource.com/pdfium.git/+log/a7e0cc8291d3..4efdb5120090


git log a7e0cc8291d3..4efdb5120090 --date=short --no-merges --format='%ad %ae %s'
2019-02-26 thestig@chromium.org Tidy CheckUnSupportAnnot().
2019-02-26 thestig@chromium.org Move FX_ParseStringString() into an anonymous namespace.
2019-02-26 thestig@chromium.org Test bad inputs for newly added annotation APIs.
2019-02-26 thestig@chromium.org Add GetAnnotDictFromFPDFAnnotation() helper function.
2019-02-26 thestig@chromium.org Simplify checks in newly added annotation APIs.
2019-02-26 thestig@chromium.org Make PartitionAlloc more like Chromium's.
2019-02-26 thestig@chromium.org Update PartitionAlloc from Chromium at r629284.


Created with:
  gclient setdep -r src/third_party/pdfium@4efdb5120090

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=dsinclair@chromium.org

Change-Id: I351aa3e580088e2dc066107e5a69f8b9755329a4
Reviewed-on: https://chromium-review.googlesource.com/c/1488962Reviewed-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@{#635742}

DEPS

@@ -147,7 +147,7 @@ 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': 'a7e0cc8291d38a63d17ddb0078205801488c0d7e',
+  'pdfium_revision': '4efdb51200909b6b878a120bbde394f1bd716ab6',
   # 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.