Roll src/third_party/pdfium/ 9d7c7ff0a..502e85921 (3 commits)

https://pdfium.googlesource.com/pdfium.git/+log/9d7c7ff0a5f0..502e85921306

$ git log 9d7c7ff0a..502e85921 --date=short --no-merges --format='%ad %ae %s'
2018-03-16 thestig Rename some variables in FPDFTextEmbeddertest.
2018-03-16 thestig Fix methods that have definition with different parameter names.
2018-03-16 hnakashima Fix typo in doc of FPDFDest_GetDestPageIndex.

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: Ia8803889d774c214787128411580a40dc131580b
Reviewed-on: https://chromium-review.googlesource.com/967368
Commit-Queue: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#543888}

DEPS

@@ -103,7 +103,7 @@ 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': '9d7c7ff0a5f0da6e7574557e5a8e82b9b5b7c1ae',
+  'pdfium_revision': '502e859213060800cc0f3bbcb5d3412c1b9d61a3',
   # 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.