Roll src/third_party/pdfium/ 405ac0f09..05e016984 (1 commit).

https://pdfium.googlesource.com/pdfium.git/+log/405ac0f09e16..05e016984447

$ git log 405ac0f09..05e016984 --date=short --no-merges --format='%ad %ae %s'
2016-11-28 tsepez Make FDF document creation return unique_ptrs

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/2533773003
Cr-Commit-Position: refs/heads/master@{#434890}

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': '405ac0f09e1622d7ff3cf60314d290851ac9f7fd',
+  'pdfium_revision': '05e01698444726fae302cd335fa4880932d7c543',
   # 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.