Roll src/third_party/pdfium/ ed4705b4d..ddcb6e7f4 (1 commit)

https://pdfium.googlesource.com/pdfium.git/+log/ed4705b4db14..ddcb6e7f47e2

$ git log ed4705b4d..ddcb6e7f4 --date=short --no-merges --format='%ad %ae %s'
2017-04-05 dsinclair Add option to pdfium_test to dump structure elements

Created with:
  roll-dep src/third_party/pdfium

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/2797133004
Cr-Commit-Position: refs/heads/master@{#462112}

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': 'ed4705b4db1405a5abef99ad1b2725eee65fedf8',
+  'pdfium_revision': 'ddcb6e7f47e2769fb4565bd4430ecb465a1f5417',
   # 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.