Roll src/third_party/pdfium/ 76a44dea3..8fa82794f (1 commit).

https://pdfium.googlesource.com/pdfium.git/+log/76a44dea3180..8fa82794ffc2

$ git log 76a44dea3..8fa82794f --date=short --no-merges --format='%ad %ae %s'
2017-01-11 tsepez Annotation deleted while retrieving it in JS

BUG=679642

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls

TBR=dsinclair@chromium.org

Review-Url: https://codereview.chromium.org/2623263002
Cr-Commit-Position: refs/heads/master@{#442968}

DEPS

@@ -64,7 +64,7 @@ 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': '76a44dea318041f8229d80e70ca3568a435611eb',
+  'pdfium_revision': '8fa82794ffc2763e9fa1fc9d401c8e9a14d7c67f',
   # 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.