Roll src/third_party/pdfium/ a1e87070a..555b31faa (1 commit)

https://pdfium.googlesource.com/pdfium.git/+log/a1e87070ac95..555b31faa192

$ git log a1e87070a..555b31faa --date=short --no-merges --format='%ad %ae %s'
2017-09-05 dsinclair Remove unused CFX_WordBreak::Next method

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

Change-Id: I6777dc97d218f6e561fda77a310282fd85d526e0
Reviewed-on: https://chromium-review.googlesource.com/652666
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#499969}

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': 'a1e87070ac95bb9dba76d7e31ec9ddeb9bc75cd3',
+  'pdfium_revision': '555b31faa192c7a85c84979bea28d4914e93c784',
   # 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.