Roll src/third_party/pdfium 6caa1897fd2c..9d1193b591c5 (6 commits)

https://pdfium.googlesource.com/pdfium.git/+log/6caa1897fd2c..9d1193b591c5


git log 6caa1897fd2c..9d1193b591c5 --date=short --no-merges --format='%ad %ae %s'
2019-06-21 thestig@chromium.org Clean up image_diff_png.cpp.
2019-06-21 thestig@chromium.org Change PNG functions to return std::vector.
2019-06-21 tsepez@chromium.org Ensure CPDF_ColorSpace classes are only created via MakeRetain<>.
2019-06-21 thestig@chromium.org Check encoding results in DiffImages().
2019-06-21 chinsenj@google.com Move PNG encoding logic to helper in pdfium_test_write_helper.cc
2019-06-21 tsepez@chromium.org Make SharedCopyOnWrite() invoke class-specific Clone() method.


Created with:
  gclient setdep -r src/third_party/pdfium@9d1193b591c5

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=pdfium-deps-rolls@chromium.org

Change-Id: Ie9762abb8a8978523d98502d4d34c396979e0724
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672168Reviewed-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@{#671464}

DEPS

@@ -158,7 +158,7 @@ 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': '6caa1897fd2c681fdc720dfa92c2b93f8e2645aa',
+  'pdfium_revision': '9d1193b591c5ac53cf1680c80692911f7dd26607',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.