Roll src/third_party/pdfium/ 59aa827d6..2c559dc57 (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/59aa827d6b41..2c559dc57639

$ git log 59aa827d6..2c559dc57 --date=short --no-merges --format='%ad %ae %s'
2017-09-08 art-snake Use CPDF_ReadValidator to request linearized hint tables.
2017-09-11 art-snake Simplify CPDF_Parser::LoadCrossRefV4

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: I0da8f131b0ae8599a026367eb3700b578c81e0ac
Reviewed-on: https://chromium-review.googlesource.com/672151
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502774}

DEPS

@@ -65,7 +65,7 @@ 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': '59aa827d6b41443ecfb2afe1d4ab9f0029b9e536',
+  'pdfium_revision': '2c559dc576392e69208895f2632f49ee43903d48',
   # 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.