Roll src/third_party/pdfium a2c2a9d2a1e7..774c90d5ec92 (3 commits)

https://pdfium.googlesource.com/pdfium.git/+log/a2c2a9d2a1e7..774c90d5ec92


git log a2c2a9d2a1e7..774c90d5ec92 --date=short --no-merges --format='%ad %ae %s'
2018-06-28 art-snake@yandex-team.ru Use UnownedPtr for document within CPDF_XXXAvail.
2018-06-27 art-snake@yandex-team.ru Remove useless code.
2018-06-27 thestig@chromium.org Remove CPDF_Parser::ParseIndirectObjectAtByStrict().


Created with:
  gclient setdep -r src/third_party/pdfium@774c90d5ec92

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: I90186778884347aa82fc143acb9c0aa70643de9a
Reviewed-on: https://chromium-review.googlesource.com/1117483Reviewed-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@{#571013}

DEPS

@@ -129,7 +129,7 @@ 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': 'a2c2a9d2a1e718e08bb90f92a2f24f4cb990189f',
+  'pdfium_revision': '774c90d5ec92d2c58d821c445230d8cb71928dcb',
   # 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.