Roll src/third_party/pdfium ce4b14e..6ffd840 (10 commits)

https://pdfium.googlesource.com/pdfium.git/+log/ce4b14e..6ffd840


git log ce4b14e..6ffd840 --date=short --no-merges --format='%ad %ae %s'
2018-06-06 tsepez@chromium.org Remove still more v8::Context slot usage.
2018-06-06 rharrison@chromium.org Unsuppress dynamic_password_field_background_fill.pdf
2018-06-06 art-snake@yandex-team.ru Reland "Simplify CPDF_HintsTable."
2018-06-06 rharrison@chromium.org Add ability to log click events reaching PDFium
2018-06-06 hnakashima@chromium.org Embedder tests can write saved PDFs to a file for debugging.
2018-06-06 tsepez@chromium.org Get global consts without use of v8::Context slot
2018-06-06 tsepez@chromium.org Stop using some v8::Context slot to find runtime.
2018-06-06 dsinclair@chromium.org [fm2js] Fixup initialized variable conversion
2018-06-06 dsinclair@chromium.org [xfa] Make class error description better
2018-06-06 art-snake@yandex-team.ru Simplify check root availability.


Created with:
  gclient setdep -r src/third_party/pdfium@6ffd840

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: I2a5c7744e80be5a86b557eaca8073b6b5ab70cd1
Reviewed-on: https://chromium-review.googlesource.com/1089970Reviewed-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@{#565108}

DEPS

@@ -126,7 +126,7 @@ 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': 'ce4b14ef28ea4c78fe07f271c7185fe9766f7c55',
+  'pdfium_revision': '6ffd840c1f4d7d74a6c4c07c5791c4f3db8d50b9',
   # 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.